Early childhood development is the period of rapid physical, psychological and social growth and change that begins before birth and extends into early childhood.[1] While early childhood is not well defined, one source asserts that the early years begin in utero and last until 3 years of age.[1]
- ^ a b Alderman, Harold; Behrman, Jere R.; Glewwe, Paul; Fernald, Lia; Walker, Susan (2017). "Evidence of Impact of Interventions on Growth and Development during Early and Middle Childhood". Disease Control Priorities, Third Edition (Volume 8): Child and Adolescent Health and Development. The International Bank for Reconstruction and Development / The World Bank. pp. 79–98. doi:10.1596/978-1-4648-0423-6_ch7. ISBN 978-1-4648-0423-6. PMID 30212122.
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