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Your baby seem to have developed superficial skin burns.
I would advise you to keep the area clean and dry.
Use an antiseptic solution or lukewarm water to clean the area twice a day
Apply an antibiotic cream like mupirocin
gel, as this will decrease the chances of superadded infection as any kind of infection over the affected area will lead to increased chances of scarring and pigmentation.
Also use a sunscreen regularly before going out in the sun.
Give oral antihistamines to reduce the redness
You can additionally give oral vitamin C supplementation in order to speed up the healing process.
The burn will heal in a span of 5-7 days if proper care is taken.
Hope it helps
Dr Geetika Paul