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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.
Merriam-Webster dictionary simply says a newborn is a baby who is recently born and does not put an upper limit to the term. The dictionary also defines an infant as a child in the first stage of life but doesn't give any age specifics.