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!!!!!