Babies learn how to use a nipple more efficiently, but the initial use is innate: https://en.wikipedia.org/wiki/Primitive_reflexes#Rooting_reflex https://en.wi

Babies learn how to use a nipple more efficiently, but the initial use is innate: https://en.wikipedia.org/wiki/Primitive_reflexes#Rooting_reflex https://en.wikipedia.org/wiki/Primitive_reflexes#Rooting_ref...