M.D.
i just wondered have you tried other "types" of milk
I know i was allergic when wias young, they got somany other types of milks that are ok for a baby/toddler these days
They have soy, or soy free, they have an almond milk, which actually worked for me, they have rice milk too.
try a whole food store, they usually know what is ok safe wise for a lil kid inthat area, of how sensitive is with digestion onthe insides.
i would say rice milk, as babies eat ric ein almsot alltheir foods growin gup.
consult your pediatrision in this reguard to given your child ric emilk, See if that is an ioption, even add alil "water" if neede to it to dilute if youthink its to thick. Check the ingredentns on vitiums they get.
you can do nursery water with rice milk, zap for 10-20 seconds. and give your child that.
some kids likeit some dont