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Babies start off wildly dependent and grow very quickly in the first three years of life. Because they change so rapidly, this period comes with its own stages of parent/caregiver development too: The ...

Tanner stages are a tool used by healthcare providers to evaluate development in puberty. They detail five specific stages of physical change in puberty, including genital, breast, and pubic hair ...

Carlo Valerio Bellieni does not work for, consult, own shares in or receive funding from any company or organization that would benefit from this article, and has disclosed no relevant affiliations ...