Early child care and early child development: Major findings of the NICHD study of early child care. Impact of the COVID-19 pandemic on early child cognitive development: Initial findings in a longitu...Early child care and early child development: Major findings of the NICHD study of early child care. Impact of the COVID-19 pandemic on early child cognitive development: Initial findings in a longitudinal observational study of child health. A review of research on the effects of early childhood education and care (ECEC) on child development. Nonmaternal care and family factors in early development: An overview of the NICHD Study of Early Child Care.