Ok thank you so much @proudmomma7,

Use head and shoulders 3 times a week. Just get a children's soft bristle tooth brush and do circles with the shampoo on his head and it will be gone within a week, DON'T use baby oil or any kind of oil, people think cradle cap is dryness because it is flaky so they add oil but it's actually her head is producing too much oil and needs dried out