They just do . Its just a natural thing
They don't really "hit" people. Its just because the baby is moving around inside the mothers tummy and you can sometimes feel the kick of it.
Birds don't have live young; they lay eggs.
Yes sometimes the babies kick's can hurt
babies
Farm Babies and Their Mothers - 1954 was released on: USA: 1954
Tiger babies suckle milk from their mothers.
You could check any time, but once the babies are feeding themselves on solid food it is advised to remove them as some mothers can turn on the babies and kick them to death for no apparent reason.
The Kick Inside was created in 1975-06.
They nurse their babies. Like all mammals, they give their babies milk.
Piglets (babies) Sows (mothers) Boars (fathers)
Tiger babies suckle milk from their mothers.
Echidnas are mammals, so the young feed on mothers' milk.