At his age, it's important that breastmilk continue to be his main source of nutrition for several more months. With that in mind, it IS possible to overfeed solids. Keep an eye on his nursing habits to get an idea of how much is too much. He should be nursing at least 3-4 times per day. If he starts losing interest in nursing or he decreases the amount of time he spends at the breast, that's a cue that you might need to cut back on solids a bit. Also, if he starts showing signs of constipation, that can also be a sign that he isn't getting enough liquids. If it seems like he could eat more, you could try giving him a bit more if you'd like and see how he does. HTH!