In addition to Clare's great advice, you want to make sure he's getting the "right" amount of breastmilk or formula first, then adjust his solids intake from there. If he's on formula, he should be getting around 32 oz per day. If he's nursing, he should still be nursing at least 4 times per day and not losing interest in his nursing sessions. Once you know he's getting enough of the good stuff, you can find a good balance of solids that's just right for him. Some babies are only interested in 1 teaspoon per meal, others eat several tablespoons, so it really varies quite a bit. HTH!