I have a grandson with Celiac disease and it is really insane the changes my daughter had to make in their diet. Virtually everything had to change and it is really expensive. Even the things that say 'modified milk ingredients' may be thickened with wheat products, so they have to read every label and finally just went all raw & natural foods as much as possible.

I also have a little boy in my daycare who has a lactose allergy and his poop at age 13-14 months were like a newborn. The parents didn't believe me when I told them it wasn't normal, then the Dad told me he was lactose intolerant. They have finally switched their baby to lactose free products and he has improved in leaps and bounds in his health and temperament in just the last few months. It's a lot of work but worth it to have a happy baby.

Definitely get the parents to supply any specialty foods because it shouldn't cost you any extra to run your daycare.