1.) An infant. A human between the ages of zero and two.
2.) An insult. Someone who is
emotional and childish. Shouldn't get taken seriously.
3.) A pet name. Usually for your child or your
significant other.
Sometimes people will call strangers who are younger than them "baby", too.
1.) "Mama, I just had my baby! You're a Granny, now! His name is Nick."
2.) "Have you met Sam, yet? She's such a baby. She cried, because her team lost in
basketball in 2nd period."
3.) "Hey, Baby, did you
have a good day at work today? I sure didn't.
Maybe tomorrow."