baby (Noun) — A very young child (birth to 1 year) who has not yet begun to walk or talk. ex. "the baby began to cry again" ex. "she held the baby in her arms" ex. "it sounds simple, but when you have your own baby it is all so different"
baby (Noun) — The youngest member of a group (not necessarily young). ex. "the baby of the family" ex. "the baby of the Supreme Court"
baby (Noun) — An immature childish person. ex. "stop being a baby!"
baby (Noun) — An unborn child; a human foetus. ex. "I felt healthy and very feminine carrying the baby" ex. "it was great to feel my baby moving about inside"
baby (Noun) — (slang) sometimes used as a term of address for attractive young women.
baby (Noun) — A very young mammal. ex. "baby rabbits"
baby (Noun) — A project of personal concern to someone. ex. "this project is his baby"
baby (Noun) — Someone who is loved (used as term of endearment).
baby (Verb) — Treat with excessive indulgence. ex. "grandparents often baby the children"
baby (Adjective) — Intended for or relating to babies.
baby (Adjective) — Smaller than normal. ex. "baby onions"