Hi A.. My 8mos old son is a little porker as well. Some babies are just bigger than others. I think the first thing to consider is his ht/wt ratio. If his weight is within proportion of his height, than I think he's okay (just my opinion, I'm not a doc). My son is in the 95th% for both height and weight, my first son was big too. If your son is in the 90th% for weight but only 20th% height, just for example, you may want to talk with your pediatrician. I would also try giving him the single grain oatmeal or rice cereal in the morning or afternoon. I gave my son the oatmeal with a stage 1 fruit mixed in it. He loved it. It seemed to keep him satisfied and lasted throughout his naps. Are you formula feeding or giving him breastmilk? If you want him to sleep longer at night, I would try some rice cereal in his milk at night. My son preferred rice cereal mixed in his milk, not the oatmeal. If you are using a stage 1 nipple on your bottle, you may need to get one that has a larger opening so he can get the cereal through. I don't know of a special nipple, just a larger hole or advanced stage one. I did this with expressed breastmilk. I wouldn't make the bottle thick, but added just enough to satisfy his appetite for at least 5-6 hours. If you are ever concerned, don't hesitate to call your pediatrician, that's what they are there for. Hope this helps. Good luck!!! Oh, and just like Linda below, my older son, now 3 1/2, is a very tall and slender kid. He was a chub like my little one is, but is now very tall, slender, healthy, and active!!! Look out for your little one, sounds like he's on the same path. Enjoy because it goes by too quick. :)