The ability to compare plays a key role in how humans learn, but words that describe relations between objects, like comparisons, are difficult to learn. We examined how children learn size comparison words, and how their interpretations of these change across development. One-hundred-and-forty children in England (36-107 months; 68 girls; majority White) were asked to build block structures that were bigger, longer, smaller, shorter, or taller than an experimenter's. Children were most successful with words that refer to size increases. Younger children were less accurate with smaller and shorter, often building bigger structures. The dimensional aspect of taller emerged gradually. These findings suggest that children's interpretation of the meaning of size comparison words changes and becomes more precise across development.

Adults readily coordinate on temporary pacts about how to refer to things in conversation. Young children are also capable of forming pacts with peers given appropriate experimenter intervention. Here, we investigate whether parents may spontaneously provide a similar kind of scaffolding with U.S. children in a director-matcher task (N = 201, 49% female; ages 4, 6, 8). In Experiment 1, we show that parents initiate more clarification exchanges with younger children who, in turn, are more likely to adopt labels introduced by the parent. We then examine whether the benefit of such scaffolding acts primarily through childrens' difficulties with comprehension (Experiment 2) or production (Experiment 3). Our findings suggest that parents primarily scaffold pacts by easing children's production difficulties, modeling cooperative communication.

With age, people increasingly emphasize intent when judging transgressions. However, people often lack information about intent in everyday settings; further, they may wonder about reasons underlying pro-social acts. Three studies investigated 4-to-6-year-olds', 7-to-9-year-olds', and adults' (data collected 2020-2022 in the northeastern United States, total n = 669, ~50% female, predominantly White) desire for information about why behaviors occurred. In Study 1, older children and adults exhibited more curiosity about transgressions versus pro-social behaviors (ds = 0.52-0.63). Younger children showed weaker preferences to learn about transgressions versus pro-social behaviors than did older participants (d = 0.12). Older children's emphasis on intent, but not expectation violations, drove age-related differences (Studies 2-3). Older children may target intent-related judgments specifically toward transgressions, and doing so may underlie curiosity about wrongdoing.

The present study investigated how Black and White American children, ages 6 to 9.5 years and 9.5 to 12 years (N = 219, M = 9.18 years, SD = 1.90; 51% female) evaluated vignettes in which peers included a same- or cross-race peer in a high-intimacy or low-intimacy context. These data were collected from 2021 to 2022. Children expected characters to be less likely to include cross-race peers in high- than low-intimacy contexts. They also evaluated cross-race exclusion more negatively in high- and low-intimacy contexts. Black participants evaluated cross-race exclusion more negatively than did White participants. Older participants were more likely to personally include a cross-race peer. This study is a first step toward understanding the role of intimacy in cross-race peer relationships.

Social skills are dynamic developmental constructs typically measured using assessments developed via cross-sectional methods. The measurement model of derivatives (MMOD), a factor analytic approach targeting individual growth trajectories, was used to evaluate the longitudinal factor structure of the Social Skills Improvement System-Rating Scales (SSIS-RS) teacher form with a sample of 1320 first and second grade students (51.6% female, 54.8% white, 20.6% Black, 14.4% Hispanic). Although results provided support for three of the original SSIS-RS factors (Assertion, Empathy, Self-Control), there was some evidence that the other four original domains (Cooperation, Responsibility, Engagement, Communication) could be explained by two factors in this age range. Implications for using the SSIS-RS and the utility of the MMOD in developmental research are discussed.

Overparenting-taking over and completing developmentally appropriate tasks for children-is pervasive and hurts children's motivation. Can overparenting in early childhood be reduced by simply framing tasks as learning opportunities? In Study 1 (N = 77; 62% female; 74% White; collected 4/2022), US parents of 4-to-5-year-olds reported taking over less on tasks they perceived as greater learning opportunities, which was most often the case on academic tasks. Studies 2 and 3 (N = 140; 67% female; 52% White; collected 7/2022-9/2023) showed that framing the everyday, non-academic task of getting dressed as a learning opportunity-whether big or small-reduced parents' taking over by nearly half (r = -.39). These findings suggest that highlighting learning opportunities helps parents give children more autonomy.

Using data from the Early Childhood Longitudinal Study-Kindergarten Class of 2011 (n = 14,370; 51% Male; 51% White; 14% Black; 25% Hispanic; 4% Asian; and 6% Other), this study examined the cumulative, timing-specific, and enduring associations between student-teacher relationships in the United States and a broad range of student outcomes. Student-teacher conflict and closeness were consistently associated with outcomes between kindergarten and third grade, both contemporaneously and over time. The main exception was for student absenteeism, where there were less consistent associations with student-teacher conflict. Cumulative models underscore the significance of the overall experiences of high-quality relationships over time. Despite little evidence of variability, girls fared less well socially due to more conflictual and less close relationships with their teachers than boys.

Purpose offers several important benefits to youth. Thus, it is necessary to understand how a sense of purpose develops in supportive contexts and what psychological resources can help. From 2021 to 2022, this study investigated purpose change among 321 youth (M = 16.4 years; 71% female; 25.9% Black, 33.3% Asian, 15.6% Hispanic/Latinx, 13.4% White, 9.7% multiracial) participating in GripTape, a ~10-week self-driven learning program. Many youth started with high initial purpose that increased throughout enrollment (Strengthening), whereas others began with slightly lower purpose that remained stable (Maintaining). For each unit increase in baseline agency, youth were 1.6x more likely to be classified as Strengthening. As such, agency may be a resource that helps youth capitalize on certain types of environments.

Language exposure is an important determiner of language outcomes in bilingual children. Family language strategies (FLS, e.g., one-parent-one-language) were contrasted with parents' individual language use to predict language exposure in 4-31-month-old children (50% female) living in Montreal, Quebec. Two-hundred twenty one children (primarily European (48%) and mixed ethnicity (29%)) were learning two community languages (French and English) and 60 (primarily mixed ethnicity (39%) and European (16%)) were learning one community and one heritage language. Parents' individual language use better predicted exposure than FLS (explaining ~50% vs. ~6% of variance). Mothers' language use was twice as influential on children's exposure as fathers', likely due to gendered caregiving roles. In a subset of families followed longitudinally, ~25% showed changes in FLS and individual language use over time. Caregivers, especially mothers, individually shape bilingual children's language exposure.

Digital technology enables parents and adolescents to communicate anywhere and anytime. Knowledge of parent-adolescent online communication, however, is mainly based on cross-sectional studies. In this preregistered 100-day diary study, 479 adolescents (M = 15.98, 54.9% girls; 96.9% Dutch) reported daily if they had communicated with their parents online, how long (i.e., duration), and what they discussed (i.e., topics). Parent-adolescent online communication took place on 43% of days, for an average of 20 min a day, and predominantly concerned micro-coordination. Five profiles of parent-adolescent online communication were identified, with most adolescents (55.4%) communicating relatively infrequently and briefly. Boys and younger adolescents communicated longer than girls and older adolescents. Although parent-adolescent online contact is possible all day, very few adolescents do so.

Children raised in chaotic households show affect dysregulation during later childhood. To understand why, we took day-long home recordings using microphones and autonomic monitors from 74 12-month-old infant-caregiver dyads (40% male, 60% white, data collected between 2018 and 2021). Caregivers in low-Confusion Hubbub And Order Scale (chaos) households responded to negative affect infant vocalizations by changing their own arousal and vocalizing in response; but high-chaos caregivers did not, whereas infants in low-chaos households consistently produced clusters of negative vocalizations around peaks in their own arousal, high-chaos infants did not. Their negative vocalizations were less tied to their own underlying arousal. Our data indicate that, in chaotic households, both communicating and responding are atypical: infants are not expressing their levels of arousal, and caregivers are under-responsive to their infants' behavioral signals.

Australian children aged 6-9 years (N = 120, 71 females; data collected in 2021-2022) were tasked with remembering the locations of 1, 3, 5, and 7 targets hidden under 25 cups on different trials. In the critical test phase, children were provided with a limited number of tokens to allocate across trials, which they could use to mark target locations and assist future memory performance. Following the search period, children were invited to adjust their previous token allocation. Although 8- to 9-year-olds prospectively allocated proportionately more tokens to more difficult trials, 6- to 7-year-olds did so only in retrospect. During middle childhood, humans become increasingly adept at weighing up when to rely on their unaided capacities and when to offload cognitive demand.

This study examines paternal and maternal sensitivity as predictors of toddlers' attachment security in two naturalistic contexts. Seventy-three mostly White middle-class families participated between 2015 and 2019 when children (49.3% girls) were approximately 29.48 months old. Each child-parent dyad completed a home and playground visit. Findings revealed paternal and maternal sensitivity were significantly associated at home and marginally at the playground. Paternal sensitivity was only predictive of security to the father at the playground, showing a medium effect, while small effects of maternal sensitivity on security to the mother were found in both contexts. Cross-parent contributions to security were small and limited to the playground. The need to consider the greater ecology of child-parent relationships and suggestions for larger-scale research are discussed.

Speech-in-noise perception is consistently reported to be impaired in learning disorders, which stresses the importance of documenting its developmental course in young children. In this cross-sectional study, ninety children (41 females, 5.5-11.6 years old) and nineteen normal-hearing adults (15 females, 20-30 years old) were tested with a newly developed closed-set speech perception in babble-noise test, combining two levels of phonological difficulty and two noise levels. Results showed that speech-in-babble-noise perception takes a definite maturation step around 7 years of age (d = 1.17, grade effect) and is not mature at 10 years of age when compared to young adults (d = 0.94, group effect). Developmental trajectories of both accuracy and response times were evaluated, with influences of psycholinguistic factors, to foster the development of adequate screening tests.

To address the widespread mental health crisis facing adolescent girls, this study examined whether a growth emotion mindset lesson can enhance emotional competence. During 2018-2022, adolescent girls (M = 15.68 years; 66.3% White) were randomized to a growth mindset (E-MIND; N = 81) or brain education (control; N = 82) lesson, completed the Trier Social Stressor Test, and reported on various aspects of emotional competence. Compared with the control group, the E-MIND group reported more adaptive emotion mindsets, higher emotion regulation self-efficacy, and more proactive in vivo and daily efforts to regulate emotions (effect sizes = small-to-medium to medium), with several differences remaining 4-month later. Findings provide novel insight into one promising approach for cultivating emotional resilience among adolescent girls.

Most cognitive training programs are adaptive, despite limited direct evidence that this maximizes children's outcomes. This randomized controlled trial evaluated working memory training with difficulty of activities presented using adaptive, self-select, or stepwise compared with an active control. At baseline, immediately, and 6-months post-intervention, 201 Australian primary school children (101 males, 7-11 years) completed working memory tests (near and intermediate transfer) and the Raven's Standard Progressive Matrices, and caregivers completed the attention-deficit/hyperactivity disorder-Rating Scale-5 (far transfer). The intervention comprised ten 20-min sessions delivered in class. For each training condition, compared with the active control, there was no evidence of transfer immediately or 6-months post-intervention (negligible to small effects). This trial provides no evidence that adaptive working memory training maximizes children's outcomes.

This study explored young children's mental health trajectories during the pandemic (May 2020 to April 2021) as well as associations with family functioning (i.e., cohesion, conflict, chaos, and routines) using data reported by 204 parents (children M 5.49; 45% girls, 90% White). Children's internalizing problems decreased early on with the onset of the pandemic, but then leveled off, while no change in externalizing problems was found. Family conflict and chaos were significantly associated with internalizing and externalizing problems at the within- and between-family level, when examined independently. When family-level factors were evaluated simultaneously, family conflict emerged as a robust risk factor. Intervention efforts, specifically for families experiencing increased conflict, may help support the mental health needs of children.

The usage of high-quality learning applications (apps) at home may increase children's mathematical and literacy competencies. This approach was tested in a family intervention study. Intervention families (n = 302) in two German cohorts (N = 500; M (SD) = 61.0 (4.6) months; n = 302) received tablets with newly developed learning apps focusing either on mathematical or literacy learning for every-day usage at home across half a kindergarten year. Compared with two control groups with and without tablets, children in the intervention groups significantly enhanced their specific competencies (η = .03-.10). Higher app usage was associated with greater gains (ΔR = .01-.02). Consequently, an easy-to-apply app-based intervention supports children's development of cognitive competencies and helps prepare them for school.

Infants differ in their level of eye movement control, which at the extreme could be linked to autism. We assessed eye movements in 450 twins (225 pairs, 57% monozygotic, 46% female, aged 5-6 months) using the gap-overlap eye-tracking task. Shorter latency in the gap condition was associated with having more parent-rated autistic traits at 2 years. Latency across the task's three conditions was primarily explained by one highly heritable latent factor likely representing individual differences in basic oculomotor efficiency and/or in visual information processing. Additionally, disengagement of attention was linked to unique genetic factors, suggesting that genetic factors involved in visual attention are different from those involved in basic visual information processing and oculomotor efficiency.

Predictors of friendship stability from individual attributes and dyadic similarities were assessed using cross-classified multilevel analyses in this 6- to 8-month longitudinal study of 10-year-old US (White, Black, Asian, other; n = 477, 50% girls), Chinese (n = 467, 59% girls), and Indonesian (Sudanese, Javanese, other; n = 419, 45% girls) children with complete participation and reciprocated baseline friendships. Across countries, individual attributes of social preference, popularity, and academic achievement and dyadic social preference similarity positively predicted friendship stability. Dyadic similarity of popularity, academic achievement, and aggression respectively predicted friendship stabilities of US, Chinese, and Indonesian children. Both individual attributes and dyadic similarity predicted friendship stability, with results that varied across countries consistent with attributes' reputational salience.

Little is known about how discrimination contributes to health behaviors in childhood. We examined the association between children's exposure to discrimination and their snacking behavior in a sample of youth of color (N = 164, M = 11.5 years, 49% female, 60% Black, 40% Hispanic/Latinx). We also explored whether children's body mass index (BMI) or sleepiness moderated the association between discrimination and calorie consumption. The significant link between discrimination and calorie consumption was moderated by children's BMI, such that discrimination was associated with calorie consumption for children with BMI percentiles above 79%. Children's sleepiness did not serve as an additional moderator. Efforts to promote health should consider children's broader socio-contextual experiences, including discrimination, as factors that may shape eating patterns.

Extensive evidence documents negative consequences of adversity for children's development. Here, we extend such work by looking beyond average effects to consider variation in susceptibility to both threat and deprivation in terms of cognitive and social-emotional development, using an influence-statistic methodology. Data come from the ongoing Avon Longitudinal Study of Parents and Children (N = 14,541, 49.1% female, age range: 6 month to 12 year, race and ethnicity: 97.8% white, 0.4% black, and 0.6% other). With respect to anticipated associations of threat with problem behavior and of deprivation with cognition, results of this pre-registered research revealed that a roughly equal proportion of children proved to be susceptible in a domain-general manner (similarly influenced) and a domain-specific one (dissimilarly influenced). Implications for intervention are considered.

This study investigated 3- to 5-year-olds' (N = 64, 37 girls, 62.5% White, data collected between 2021-2022) ability to use probabilistic information gleaned through active search to appropriately change or maintain expectations. In an online fishing game, children first learned that one of two ponds was good for catching fish. During a subsequent testing phase, children searched the ponds for fish. Half saw outcomes that were probabilistically consistent with training, and the other half saw outcomes that were probabilistically inconsistent. Children in the Inconsistent condition adapted their search strategies, showing evidence of changing their expectations. Those in the Consistent condition maintained their initial search strategy. Trial-by-trial analyses suggested that children used a combination of heuristic and information integration strategies to guide their search behavior.

Children's foundational mathematical skills are critical for future academic attainment. While home mathematical activities (HMAs) have been proposed to support these skills, the extent to which engaging in them supports mathematical skills remains unclear. This preregistered systematic review and multilevel meta-analysis identified 351 effect sizes from 72 samples in 20 countries, exploring the relation between frequency of HMAs and mathematical skills in children aged 7 years and under (M = 61 months). A small significant positive relation was found (r = .13), moderated by risk of bias, with larger effects associated with a higher risk of bias. Specific ways the field can move forward are discussed to better understand the role of the home mathematical environment in early mathematics.

This study examined the role of parental involvement in the home learning environment in the association between parental mental health and child cognitive performance. In a sample of 174 three- to five-year-old children (52% female, 97% White, 7% Hispanic, 2019-2022), playful activities moderated the relation between parental general depression and child verbal reasoning and acquired verbal knowledge. However, there was no evidence that parental involvement moderated the association between parental mental health and child spatial reasoning. These results improve our understanding of the pathways by which parental mental health, even in a non-clinical community sample, relate to child outcomes and raise the possibility of leveraging playful activities as one mechanism to alleviate the potential role of parental mental health difficulties.

Few studies have focused on off-reserve Indigenous children and families. This nationally representative, cross-sectional study (data collected from 2006 to 2007) examined Indigenous- and non-Indigenous-specific determinants associated with positive socioemotional and behavioral well-being among First Nations children living off-reserve in Canada. The parents or other caregivers of 2990 two-to-five-year-old children (M = 3.65; 50.6% male) reported on their children's socioemotional and behavioral well-being and a range of child, parent, and housing characteristics. Being taught an Indigenous culture, greater community cohesion, caregiver nurturance, good parental/other caregiver health, and fewer household members were associated with better socioemotional and behavioral well-being. These results highlight the importance of leveraging Indigenous-specific determinants and acknowledging non-Indigenous-specific factors, to promote the well-being of First Nations children living off-reserve.

All children navigate the world by searching for information in their sociocultural contexts (e.g., schools, media, laws) to make sense of their experiences and potential futures. In doing so, Native children, however, must contend with the legacy and ongoing oppression of their Peoples, communities, and ways of being. In this manuscript, we highlight how sociocultural contexts stemming from settler colonialism undermine Native futures. We detail how settler colonialism, specifically its manifestation in acts of omission and misrepresentation, impacts children's self and identity development, and intergroup relations. We close by acknowledging the importance of understanding development in context, and the power that the representational landscape can have for promoting paths toward positive child development and greater equity.

Changes in family life related to globalization may include reduction in the collaborativeness observed in many Indigenous American communities. The present study examined longitudinal changes and continuities in collaboration in a Guatemalan Maya community experiencing rapid globalization. Fluid collaboration was widespread 3 decades ago among triads of mothers and 1- to 6-year-olds in 24 Mayan families exploring novel objects during home visits (Dayton et al., 2022). However, in the "same" situation 30 years later, 22 mother-child triads of their relatives spent half as much time in collaboration among all three people. This aligns with globalizing changes and with the pattern of Dayton et al.'s middle-class European American families. Nonetheless, the Mayan families maintained harmonious interactions, in line with preserving important cultural values.

Indigenous populations, including American Indians, Alaska Natives, First Nations, and other first peoples worldwide, have been largely overlooked in child development research. This commentary examines how Indigenous relationality intersects with developmental science, advocating for a shift from human exceptionalism to an interconnected relationality among people, land, and more-than-human beings. Drawing from diverse Indigenous knowledge and practices, The Six Pillars to Advance Indigenous Relationality among Children provides frameworks for integrating Indigenous worldviews emphasizing interconnected responsibilities and sustainability. Embracing Indigenous relationality-grounded in respect and reciprocity-dismantles inequitable systems, enhances socioecological well-being, and supports healthy Indigenous child development, fostering responsible relationships with the land and ensuring a sustainable future for generations.

A focus on positive child development among Indigenous children has largely been absent from developmental science. In this special section of Child Development, we sought to address continuing inequity in representation and valuing Indigenous knowledge and voices by soliciting articles that identified cultural and strengths-based factors Indigenous children, youth, and families cultivate and leverage to promote positive development. In this introduction to the special section, we provide an overview of the four empirical articles included, with attention to the ways these articles advance Indigenous paradigms and methodologies by focusing on the unique histories and strengths of four distinct Indigenous communities. We end with a discussion of how to promote continued growth and inclusiveness in developmental science with Indigenous communities.