My 4 month old was prescribed a diaper cream from the pharmacy. after using it for a day she has hives on her diaper area. should we call the doctor?

Stop the cream: Any product you apply to the skin may trigger an allergic response. It may be the main ingredient or other ingredients in the cream. Remove the product from babies skin & call during regular hours if baby is ok except for the hives. If there are other worisome symptoms call now.

Cream: Any rash should be reported asap to the pediatrician, at this age the skin is extremely fragile , don't try to go by elimination their is too much cream on the market to do that.