Stop using any baby soap for now. Visit those yoruba women that have shop where they sell Abo, explain to them. They will give you a soap for bathing your baby and also there is a flower almost like abicus flower. You will boil it and when it's warm or cool, you will be using it to bath your baby with the native soap.
I don't have the pics of the flower, but if you are interested l can tell you how to get it because it's very common