newborn define
a. a newborn or recently born child; infant. b. (as modifier): baby food. 2. (Anatomy) an unborn child; fetus. 3. the youngest or smallest of a family or group. 4. (Zoology) a. a newborn or recently born animal. b. (as modifier): baby rabbits. 5. usually derogatory an immature person. 6. slang a young woman or sweetheart: often used as a term of address expressing affection.