My 8 mo old has yeast that started on her bottom. was given happy hiney to treat. it has spread on stomach & back. this morning it's spreading to face?

Yeast rash: If this is a yeast rash, then Lotrimin (clotrimazole) AF cream will help a lot. It is not common to get yeast rash on the face, stomach and back, so this may be more of a contact dermatitis or atopic dermatitis, and then a cream with hydrocortisone will be more helpful. A yeast rash is common after antibiotics, but contact/atopic rash is more likely related to a an irritating food, loose BM's or soap, etc.

Diaper dermatitis: The yeast infection seems to have spread to other parts of body. Sometimes the steroid in the cream can make the yeast worse. You should have baby seen by your pediatrician or at a urgent care (preferably pediatric) sooner for a prescription antifungal cream. In the meantime, just use separate OTC .Lotrimin (clotrimazole) cream, keep area dry.