“The practice of separating embryonic development from fetal periods is clearly somewhat arbitrary, as most biologic events are not timed precisely…Indeed, many of these processes are not confined to fetal life but extend well into the postnatal period [infancy] Examples include glomerulopoieses in the kidney, alveolar, multiplication in the lung, and myelination of the nervous system.”
Gynecology & Obstetrics: A Longitudinal Approach. Thomas R. Moore, Robert C. Reiter, Robert W., M.D. Rebar, and Vicki V. Baker New York W.B. Saunders Company (October 1993) p 37
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