Diarrhea and diaper rash in new kids

I have two one year olds who have just started with me within the last month. They have both developed many loose stools throughout the day and now diaper rashes. They have both started milk recently but I can't help thinking that it is something I am feeding them but I don't think I feed them any differently than they get at home. Can you think of any reason for this to be happening to both of them at once? I am a very new hdcp so any advice would be much appreciated. I am a bit paranoid that I am doing everything "right" with my dck's.

Very possible one of them had a virus and passed it to the other, use your best judgement if they come in contact with other children. if it gets worse perhaps you should concider following your sick policy? very unlikely that two babies from diff. households will show the same signs and symptoms if there was not a relation somehow in what could be wrong with them. very likely it is not something you yourself are doing, more likely they are sharing a "bug", get ready......this is my least favorite part of daycare. Sickness and the spread of it!!!!!

It could be teething as well. One year olds teeth like mad and this is often a side effect. But I wwould have the parents take them to the doctor if them haven't already