It usually appears in the first months and clears on its own over weeks to months. Gentle washing, soft brushing and a little baby-safe oil to loosen flakes can help; avoid picking. See your doctor if the skin looks red, weepy or spreads, which can suggest something else.
Glossary
Cradle cap
Cradle cap is the common, harmless yellowish or crusty scaling on a baby's scalp, caused by overactive oil glands — not poor hygiene and not contagious.
General information, not medical advice. For concerns about your child, talk with your doctor or child-health nurse.