Hi J.,
By "milk", I'm assuming you mean formula? At 10 months of age, I'm afraid not taking in enough food and varieties there of, may mean that your son is a bit malnurished; especially if "milk" really means milk. To be on the safe side, I would suggest seeing the Pediatrician for blood work to check nutritional status as weight may not be a great indicater due to the potential high calorie intake currently (on a mostly milk diet. In some cases, a child may do fine on prodominately formula at 10 months of age, but being that your son has now begun to lose sleep/wake frequenty at night may be a indication that his diet is not working for him....It truely may be a situation where what he wants is going to need to be something different than what he gets. At 10 months of age, he is not the one preparing milk on a regular basis :) With every child, it always seems like there is that one thing that they struggle with. If its not sleep, it's eating, or potty training, etc. Fluids may need to be offered after a solid meal. I promise your son will not starve himself. It will be hard, not doubt, but it is so doable :) Good Luck, God Bless, K. R.N.