U can apply microderm powder in case of heat rashes. Doc prescribed me for my baby n it work best for rashes

U can use mamaearth baby lotion . Totally chemical free .suits all kind of skin . Mild fragrance

Yes u can and use baby dusting powder

You can be applying baby powder which prevents rashes

U can try mamaearth baby lotion and cream . I am using it after stopping massage for my elder son . It's very good . Keep skin soft and best thing is totally chemical free