I just replied on the autism forum. I hope you meant "soy yogurt" and not regular yogurt. Just a heads-up... some autistic kids have problems with soy, too, so I wouldn't go too heavy on it. There is rice milk and almond milk and even potato-based milk. I hope you are reading the labels. Some of this stuff is surprising because even if it is soy-based, it may still have cow's milk in it.

Oh, and when I mentioned allergy labeling laws over on the other thread, that was for the US. I'm not sure if you're in the US. If not, I can't help you with your laws.