I have a nine month old who weighs 16 lbs and 1 oz and is 27 inches long. He is still in 3-6 month clothes. My son had his 9 month appointment yesterday and the doctor is starting to get more concerned about his weight. It's really starting to worry me too. The doctor told me to let him eat whatever he wants, when he wants. We already do that, but he is still pretty small. He has 3-4 6oz bottles a day. Plus baby food. He has 7 teeth already. He crawls, crawls up the stairs (supervised), try's to stand on his own, and pulls up. He seems to be doing what normal nine month olds do. He doesn't say words word like mama or dada yet. Has anyone else gone through a similar experience with their baby?