If your child is allergic to milk, flavored plant juice alternatives like rice and soy, when fortified, can fill in some gaps, but outside necessity, they are not nutritionally equal to dairy
, no matter what marketing departments claim.
Once upon a time, the US government protected consumers with Standards of Identity, they sued a cheese company for putting how much milk was in a slice of its cheese because of even the inference
it had as much calcium as milk.
No more. Squeeze any plant and add some vanilla flavor and you can call it milk and Washington, DC does not think that is deceptive.