Does your child have cradle cap? All of mine have suffered with it as babies to varying degrees, some for longer than others. It’s actually a really common condition that first appears within a few months after birth and although it often looks quite unsightly it’s *usually* completely harmless (I’ll explain the usually bit later).
Most of the time it will disappear of it’s own accord with no treatment at all but some cases might need some encouragement before it clears up. Needing medical treatment for cradle cap is rare.