When a baby has cradle cap it is caused by excessive oil on the baby's
scalp. To prevent it wash the baby's hair daily and don't not use any
oil in his/her hair.
If the cradle cap already develops put some baby
oil on the scalp to loosen the cradle cap then take the baby's comb and
gently scratch it out. Then wash his/her hair properly until all the oil
and cradle cap is gone.