What should one to for a toddler who is having an alergic reaction?

See a dr. See the dr. Allergic reactions occur in different ways. Some are justy mild skin manifestations, others are life threatening.
Benadryl (diphenhydramine) Benadryl (diphenhydramine) will help with a mild to moderate reaction. If your toddler is having difficulty breathing, swelling of the lips or tongue, getting lethargic, or appears to be doing poorly, call 911 or go to the er immediately, as this is a medical emergency.