I'm exhausted tonight and might have missed this but....have you or can you decrease the amount of milk and dairy he has with you during the day? I have a child with a milk allergy right now so the parents send his food and milk everyday. I just give him milk once a day and send the rest home.

I also had a child with a milk sensitivity but I supplied the food. I would buy lactose free yogurt and just gave that to all the kids. Are there things like that, that you could buy and feed him instead?