Regular nonparental care during the first five years of life has become the
norm, rather than the exception, during the past 30 years in the United St
ates. Parents and professionals have expressed concerns about the impact of
such care on children's development. Initially, much of the research focus
ed on whether, when, and how much nonparental care the child received, sugg
esting that early and extensive care might negatively affect children's soc
ial and cognitive development. More sophisticated studies followed in which
child care quality and family characteristics known to be related to both
quality of care and child outcomes were also examined. Much of this literat
ure indicates that children who experience better-quality care tend to disp
lay more optimal cognitive and social development than children who experie
nce lower-quality care, although the associations tend to be modest. Implic
ations for public policy are discussed.