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 chickens for the babies of birds. See for more.
verb
To coddle; to pamper somebody like an infant.
To tend (something) with care; to be overly attentive to (something), fuss over.
adjective
Of a child: very young; of the age when he or she would be termed a baby or infant.