Start by cooling your baby off. Loosen or remove his clothing, and move him into an airy room or a shady spot.
You might place him on a cotton towel, which can help absorb his 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 him air dry rather than rubbing him with a towel. And don't use ointments or creams on the rash. 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 him. Or place it far enough away so that only a gentle breeze reaches him. You want your baby to be comfortable, not chilled.
Trim your baby's fingernails regularly so he doesn't scratch himself if the rash starts itching. You may want to put little socks on his hands at night so he won't scratch himself while he sleeps.
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