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From Middle English babee, babi ("baby"), from babe ("babe, baby"), equivalent to babe + -y("endearing and diminutive suffix").

Full definition of baby

(plural babies)

A very young human, particularly from birth to a couple of years old or until walking is fully mastered.
Any very young animal, especially a vertebrate; many species have specific names for their babies, such as kittens for the babies of cats, puppies for the babies of dogs, and chicks for the babies of birds. See for more.
Unborn young; a fetus.When is your baby due?
A person who is immature or infantile.Stand up for yourself - don't be such a baby!
A term of endearment for a girlfriend or boyfriend or spouse.
(informal) A form of address to a man or a woman considered to be attractive.Hey baby, what are you doing later?
A pet project or responsibility.The annual report has been my baby since September.
The lastborn of a family.
An affectionate term for anything.See my new car here? I can't wait to take this baby for a drive.
(archaic) A small image of an infant; a doll.

used only before the noun

Of a child: very young; of the age when he or she would be termed a baby or infant.a baby boy
Of an animal: young.a baby elephant
Intended for babies.baby clothes
(of vegetables, etc.) Picked when small and immature (as in baby corn, baby potatoes).

When referring to a human baby (as per noun sense 1 above) the usual practice is to treat 'human' as the adjective and 'baby' as the noun.

To coddle.
To treat someone, especially adults or teenagers, in overbearingly defensive manner as or in a similar fashion to that of a baby.