What Newborns Know
A new baby robin already knows three things. It knows to sit very still when the parents are away. It knows to pop up and open its mouth to beg for food. It knows to poop as soon as it swallows some food.

Babies feel the bounce on the nest when a parent comes back with food. They pop up with mouths wide open. Soon they learn their parents’ sounds, too. By the time their eyes open, babies know their parents' voices.

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Photo: Dorothy Edgington