Start by cooling your baby off. Loosen or remove there clothing, and move them into an airy room or a shady spot.
You might place them on a cotton towel, which can help absorb their sweat. Apply cool, wet washcloths to the areas affected by the rash. A lukewarm bath with a little baking soda — 2 teaspoons per gallon — can also help.
Let them air dry rather than rubbing him with a towel. And don't use ointments or creams on the rash. If your baby's skin is irritable to touch, calamine lotion or hydrocortisone cream may be used with your health professional's approval. Avoid ointments or other lotions because they can irritate the skin. These can make the rash worse by trapping moisture.
If it's hot at night, use an air conditioner or a fan in your baby's room. Direct the fan near your baby but not directly on them. Or place it far enough away so that only a gentle breeze reaches them. You want your baby to be comfortable, not chilled.
Trim your baby's fingernails regularly so they don't scratch themselves if the rash starts itching. You may want to put little socks on their hands at night so they won't scratch themselves while they sleep.
However, if doesn't go away after 3 or 4 days, or if it appears to be getting worse, or if your child develops a fever, contact your health professional right away. Look for signs of infection, increased pain, swelling, redness, or warmth around the affected area. Drainage of pus from the area. Swollen lymph nodes in the neck, armpit, or groin. Fever of 100° or higher, or chills with no other known cause.