It might be as little as 5 grams a day for a tiny baby at 24 weeks, or 20 to 30 grams a day for a larger baby at 33 or more weeks. In general, a baby should gain about a quarter of an ounce (30 grams) each day for every pound (1/2 kilogram) he or she weighs. (This is equal to 15 grams per kilogram per day.
