Meaning of “baby” - Learner’s Dictionary

baby

noun [ C ] uk us /ˈbeɪbi/
CHILD

A1 a very young child:

a baby girl/boy
baby clothes
Liz has had a baby.
Maria's expecting a baby (= she is pregnant).
ANIMAL

A2 a very young animal:

a baby bird

(Definition of “baby” from the Cambridge Learner’s Dictionary © Cambridge University Press)