Specific language impairment (SLI) has traditionally been characterized as a deficit of structural language (specifically grammar), with relative strengths in pragmatics. In this study, comprehensive assessment of production, comprehension, and metalinguistic judgment of referring expressions revealed that children with SLI have weaknesses in both structural and pragmatic language skills relative to age-matched peers. Correlational analyses highlight a relationship between their performance on the experimental tasks and their structural language ability. Despite their poor performance on the production and comprehension tasks, children with SLI were able to recognize pragmatically under-informative reference relative to other types of utterance, although they imposed a less severe penalty on such expressions than typically developing peers, a pattern that supports the pragmatic tolerance account. Our novel methodology (which probed structural abilities from both the speaker's and hearer's perspectives as well as metalinguistic and pragmatic skills in the same sample) challenges the assumption that pragmatic errors stem from deficits in social cognition and instead supports recent findings suggesting that when the impact of structural language is isolated, pragmatic deficits may be resolved.

The field of infancy research faces a difficult challenge: some questions require samples that are simply too large for any one lab to recruit and test. ManyBabies aims to address this problem by forming large-scale collaborations on key theoretical questions in developmental science, while promoting the uptake of Open Science practices. Here, we look back on the first project completed under the ManyBabies umbrella - ManyBabies 1 - which tested the development of infant-directed speech preference. Our goal is to share the lessons learned over the course of the project and to articulate our vision for the role of large-scale collaborations in the field. First, we consider the decisions made in scaling up experimental research for a collaboration involving 100+ researchers and 70+ labs. Next, we discuss successes and challenges over the course of the project, including: protocol design and implementation, data analysis, organizational structures and collaborative workflows, securing funding, and encouraging broad participation in the project. Finally, we discuss the benefits we see both in ongoing ManyBabies projects and in future large-scale collaborations in general, with a particular eye towards developing best practices and increasing growth and diversity in infancy research and psychological science in general. Throughout the paper, we include first-hand narrative experiences, in order to illustrate the perspectives of researchers playing different roles within the project. While this project focused on the unique challenges of infant research, many of the insights we gained can be applied to large-scale collaborations across the broader field of psychology.

A diverse body of research conducted since the start of Covid‐19 has investigated the impact of the pandemic on children's environments and their language development. This scoping review synthesises the peer‐reviewed research literature on this topic between 2020 and 2023. Following the Joanna Briggs Institute methodology and the PRISMA extension for scoping reviews, we searched five databases for studies that fulfilled the following inclusion criteria: studies with neurotypical (monolingual or multilingual) 0‐6‐year‐old children; studies focusing on any area of language development, including sources describing literacy or educational practices that impacted language development; studies focusing in the context of the COVID‐19 pandemic, with no restrictions of geographical location or language used by participants. Ninety‐four eligible studies were identified for review. The extracted data were synthesised using frequency tables and narrative descriptions. Eligible studies used a wide range of data collection periods, methods, research sites, sample ages, sizes, and roles to fulfil 15 broad aims. They show that children's language‐learning environments were significantly impacted, with variability over time and across the socioeconomic spectrum. Together they investigated diverse language domains, as well as several home, educational, and demographic factors that were hypothesised to impact children's language development. Of those studies that focused on language outcomes, most converge to suggest a decline in typical expectations of children's language development, including their social communication, vocabulary, morphosyntax, literacy, and language of schooling, as well as general communication skills, school readiness, and other areas of academic progress. Our synthesis suggests that children's language and environment were significantly impacted by COVID‐19. This scoping review will support families, researchers, practitioners, and policymakers working with pandemic‐era children to further understand the effects of the pandemic on children's development.