Which is better soy based or cow milk infant formula?

Depends on situation. Some folks prefer the bovine protein as more human like & there is some question whether the soy lives up to its quality. That said, most kids would never have any appreciable difference in growth/development either way.The exception comes if a kid is intolerant to one. If so, the other product or a specialty formula like alumentum would be less likely to cause GI symptoms.

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What should be done if toddler is allergic to cow milk and soy based formulas?

Elemental formulas. For those who become intolerant to bovine and soy protein, there are elemental formulas that contain predigested proteins that work. You can find one (alumentum, alumentum ready to feed, nutramagen, elecare).All are expensive but after 4-6 weekss on one, the gut may heal enough to tolerate other foods. Work with your ped to find one that works for your kid.All are difficult. Read more...