A buildup of a yellowish, waxy material on the scalp can be caused by excess secretion of oil glands. Known as cradle cap, the condition can be treated with daily shampoos, scrubbing loose the scales. Often, a mild anti-dandruff shampoo (ie. Selsum) may be used one or two times a week. If you use it, be careful not to get it in your baby’s eyes, it will sting.