Longman Dictionary of Contemporary English - baby

~ n plural babies 1 »CHILD« a very young child who has not yet learned to speak or walk  (A baby was crying upstairs. | They have a five-year-old boy and a baby girl. | have a baby (=give birth to a baby))  (I think she had the baby in June. | be expecting a baby (=have a baby developing inside your body))  (- see child) 2 »ANIMAL/PLANT« a very young animal or plant  (baby birds | baby carrots) 3 »BROTHER/SISTER« a younger child in a family, often the youngest  (He's the baby of the family.) 4 »WOMAN« AmE spoken a) a way of speaking to someone that you love  (Mike baby, could you get me a glass of water?) b) a way of speaking to a young woman, often considered offensive 5 »SILLY« someone who is not behaving in a sensible way  (Don't be such a baby - take your medicine!) 6 »RESPONSIBILITY« informal something special that someone has developed or is responsible for  (Don't ask me about the building contract - that Robert's baby.)