Mosquito bites the baby genitals lead to redness and swelling, may be mosquito bites stimulation or mosquito body fluids, limb allergies lead to, you can choose to cold compresses, topical application of drugs and other ways of treatment. 1. Cold compresses: you can choose frozen saline or low concentration of potassium permanganate soaked sterile gauze local cold compresses, can reduce redness and swelling and discomfort. 2. Topical medication: Glycolite lotion can be used externally to relieve itching symptoms. Weak glucocorticosteroids such as dieldrin cream and hydrocortisone cream can be applied externally to relieve redness, swelling and itching. If your baby is stung on the genitals, you should avoid scratching and go to the hospital for timely treatment under the guidance of a physician.