It might be because of vitamin deficiency...are u giving the vit d3drops as prescribed by the doctor?

This can be some reaction to products or dryness.. u should try chemical free mamaearth baby care range it suits babies delicate skin easily and it's safe. May be this help.

hello the white patches can be due to dryness and you can be applying Moms Co natural baby lotion which helps to keep your baby skin well hydrated and prevents dryness and the white patches due to dryness

Is it spreads? Needed medical treatment ..please check once to skin specialist..