You can use mamaearth baby sunscreen lotion for your baby.its natural and dermatologically tested.

Also an spf of 30 and above would be helpful and take an ounce of it and spread it liberally

Hi Nisha, As advised by Dr Gorika Bansal. hi Nisha use a broad spectrum sunscreen , protective against uvA and uvB as that will prevent tanning . Also put aloe Vera gels after sun . Scrubbing once in a while would be helpful too. And wearing a longer skirt can do the trick which kids may not agree to.