Soy formula is especially bad. Camel milk and goat milk are good alternative to breast milk. The Weston A. Price Foundation website has an alternative recipe for breastmilk and it has been used very successfully by thousands of mothers. Soy contain a lot of estrogen-like compounds and should never be used. This leads to early puberty in girls, and perhaps over- feminization of boys. Don't use it, or give your kids soy except for fermented soy products, like miso, tempeh or soy sauce.