It's a diaper rash. You need to keep the baby clean and dry. Do not use diapers. Use cotton nappies.
As soon as the baby soils himself, clean him, wipe gently and air-dry the buttocks.
Avoid rubbing the buttocks with wet wipes or cloth. Wipe gently.
Apply coconut oil on the buttocks every time you clean him.
Apply Rash-free cream on the buttocks. And keep the area covered with a layer of the cream. If it gets wiped off, reapply it.
Health Tips
Remember to keep the area dry
Dont use diapers