I would talk to my pediatrician, especially of there are known allergies in the family. I asked ours if it would be okay for my 9 mo old ds to have some almond milk once in awhile, and he said yes, but we don't use it instead of bm- more like in addition to. My ds is very sensitive to all dairy- regardless of the animal- if it isn't Mama's milk (and I can't have any dairy, either), he throws up for hours after every meal.
Be careful with lots of soy in boys- it is estrogen-like and can cause problems if boys get too much. If you are already drinking almond, soy, coconut, or hemp, and he's not having problems, my experience with my ds is that he's unlikely to have problems if he drinks it himself.