I would just test it out. Just keep feeding him and see when he stops. That's the whole idea of BLS anyway I think, so they learn to control it and they learn when they are full, etc. Maybe he just really is that hungry, lol, or maybe he just really loves his food and doesn't know when to stop and needs some practice I really don't know but that's what I'd do. I know some times my girls have eaten crazy amounts of food that I thought would surely make them sick but they weren't! When DD1 was 9 months she ate all her dinner, then some watermelon, and then a whole mango!