 [ Symptoms ] my 4 month old has hives i am breastfeeding him what could this be caused from [ Disease ] hives indicate an allergy so it could be caused from anything in his environoment    something that he has touched aundry detergent dryer softeners soap etc  or breathed dust pollens etc it does not have to be related to breast feeding at all finding a specific cause is often impossible while you were carrying your son you might have got an allergic reaction through a food instead of it infecting you it ran to your bany and produced over the months