7 month old infant has a paular rash on etremities only, rash does not seem to bother him. Afebrile, no cough ,cold, or GI symptoms, breast fed has only had rice cereal, rash appered before intoduction of food, no new lotion ect..... I am grandma and I told his mom to just try adding 1/4 cup of vinegar to night time bath ( to alter ph a little) What thoughts do you have?