Baby breaks out in hives when sleeping, what can this be from and do we need to have it seen to urgently?

Baby with Hives: I would have your child seen immediately. The question is really are hives the only symptom or does your baby have shortness of breath/any other symptoms? American Academy of Rheumatology criteria for anaphylaxis should be ruled out by a skilled Peds ER physician. Hopefully, this is limited to a cutaneous reaction caused by detergents. Need to rule out peanut allergy/food allergy even milk allergy