Identification of language disorders in children younger than 3 years remains challenging despite agreement that early intervention improves outcomes. This study of twin language and gesture development substantiated the twinning effect, an unexplained lag in expressive and receptive language seen in twins, for a group of 88, 16- to 18-month-old…

A wealth of research evidences the positive impact of the outdoors for young children. Yet there is little relating to the experiences of babies and toddlers who attend daycare settings. This paper offers new knowledge about outdoor provision for under twos in the English context where there is a lack of explicit policy support for outdoor…

Aim: There is a lack of evidence-based tools for measuring problem-solving in young children with motor delays. The purpose of this study was to evaluate the construct validity and responsiveness of the Assessment of Problem-Solving in Play. Methods: 125 young children (10.72, SD 2.62 months) with mild, moderate, and severe motor delays were…

As the rates of Autism Spectrum Disorder (ASD) increase and early screening efforts intensify, more toddlers with high likelihood of ASD are entering the United States' (US') publicly funded early intervention system. Early intervention service delivery for toddlers with ASD varies greatly based on state resources and regulations. Research…

Joint engagement--the sharing of events during social interactions--is an important context for early learning. To date, sharing topics that are only heard has not been systematically documented. To describe the development of auditory joint engagement, 48 child-parent dyads were observed 5 times from 12 to 30 months during seminaturalistic play.…

This special issue on early self- and co-regulation addresses a topic that is founded on a rich mix of theoretical perspectives, including self-determination theory, socio-cultural theory, attachment theory and artificial intelligence. Reflecting this diversity, the papers adopt a diverse range of approaches to cutting-edge questions regarding…

This current article is drawn from a qualitative study investigating the motivations and uses of digital devices of Singapore parents with their toddlers and preschoolers (age range: 1-5-year-old children). The article focuses on three prominent empirical findings. First, parent participants tend to try using a digital device with children to…

Children with neurogenetic syndromes (NGS) experience comorbid challenging behaviors and psychopathology. We examined challenging behaviors in 86 toddlers and preschoolers across three NGS [Angelman syndrome (AS), Prader--Willi syndrome (PWS), and Williams syndrome (WS)] and 43 low-risk controls (LRC), using the Child Behavior Checklist for Ages…

The timing of events (e.g., how long it takes a child to exhibit a particular behavior) is often of interest in developmental science. Multilevel survival analysis (MSA) is useful for examining behavioral timing in observational studies (i.e., video recordings) of children's behavior. We illustrate how MSA can be used to answer 2 types of research…

Associative word learning, i.e., associating a word with an object, is an important building block of early word learning for TD infants. This study investigated the development of word-I object associations by TD infants and infants and toddlers with Williams syndrome (WS), a rare genetic disorder associated with delayed language and cognitive…

Typically developing (TD) infants adapt to the social world in part by shifting the focus of their processing resources to the relevant aspects of a visual scene. Any impairment in visual orienting may therefore constrain learning and development in domains such as language. However, although something is known about visual orienting in infants at…

Parents' reactions to toddlers' emotions were examined in relation to toddler shyness and gender in a sample of 103 parents (99 mothers, 4 fathers) of 2 year olds. Toddlers were grouped as shy (N = 52; 23 boys) or non-shy (N = 51; 25 boys) using a temperament survey administered by phone, then parents completed questionnaires regarding their…

Meta-analyses of head circumference in autistic individuals exist; however, simple meta-analytic approaches are limited. Consequently, we gathered head circumference raw data of autistic (N = 2381) and typically developing participants (N = 994) by re-analysing the data from previously published studies together. The present study found no mean…

It has been suggested that due to functional similarity, sortal object individuation might be a primordial form of psychological essentialism. For example, the relative independence of identity judgment from perceived surface features is a characteristic of essentialist reasoning. Also, infants engaging in sortal object individuation pay more…

This study estimates the effect of physical punishment on the cognitive development of 1,167 low-income Colombian children (M[subscript age] = 17.8 months old) using 3 analytic strategies: lagged-dependent variables, a difference-in-differences-like approach (DD), and a novel strategy combining matching with a DD-like approach. Across approaches,…