Your son is TOO young to be THAT manipulative. I am a mother of 4, 2 of whom are lactose intolerant like myself. Lactose intolerance causes severe cramps and major diarrhea. Maybe he's not lactose intolerant (which is the absence of the enzyme "lactase" to break down the sugar "lactose" in milk), but rather unable to process the protiens in cow milk which are different from the protiens in human milk. There are plenty of other ways to get calcium. (ex: Almonds, Asparagus, Avocados, Cabbage, Figs, Filberts, Green leafy vegetables, Kale, Oats, Prunes, Salmon (with bones), Sardines, Seafood, Sesame seeds, Soybeans, Tofu, Turnip greens, Watercress, Fennel seed,
Fenugreek, Flaxseed, Paprika, Parsley, Peppermint, Plantain,
Raspberry leaves, etc.) There is also "Juice Plus": www.whelanjuiceplus.com