My daughter is low on the scales too. She is three and weighs in at about 29lbs. She is tiny but I think that is the way she will be. I have the queen of picky, never eaters. We joke and say she eats and lives off of air. My pediatrician when presented with eating problems with her asked if I was giving her too many bottles with milk, juice ect. She said to some kids this fills them enough to curb their appetite. Toddlers tend to be too buisy to stop and eat also. So he may be relying on that bottle. I suggest calling your pediatrician. This is very serious that he has not eaten. My daughter has been undersurpressed lately, and I too have found another battle for her to eat. It has been hell to get her to eat. Good luck. Let us know how he is.