Definition Of baby
a very young child, especially one newly or recently born.
his wife's just had a baby
a young woman or a person with whom one is having a romantic relationship (often as a form of address).
my baby left me for another guy
comparatively small or immature of its kind.
a baby grand piano
treat (someone) as a baby; pamper or be overprotective toward.
her aunt babied her and fussed over her clothes