JMO, but you could always try it and see. What type of allergy testing was performed? I’m asking because RAST(blood) testing isn’t very reliable(many false + & -‘s). The best time to test for allergies is b/t 18 & 36 months of age using Skin prick or Patch testing.
Another option other than soy and is very nutritional, is Hemp milk(DAIRY & SOY FREE • VEGAN • TREE NUT FREE • GLUTEN FREE
CHOLESTEROL FREE • NON-GMO • KOSHER • LOW SODIUM
Hemp contains no known allergens). It is full of omega 3 & 6 fatty acids. Plus it contains the same amount of calcium/vitamin D that whole milk does. My DD’s Ped was very pleased w/the nutritional value hemp milk offered. Of course, we also do vitamins to ensure she’s getting anything else she may be missing. I’ll post a link to the website. They are many flavors too. Each one lists it’s ingredients and the unsweetened versions don’t contain brown rice syrup(for LOs who can’t tolerate rice).
HTH!