Hearing screening, also known clinically as newborn hearing screening, is a program that must be performed for common newborn screening required by maternal and child health care in order to detect congenital hearing impairment in newborns in a timely manner. The first hearing screening, also known as primary screening, is usually performed at the local maternal and child health hospital, 4-5 days after birth. It is normal for both ears to pass with flying colors. If a child fails to pass the test in one or both ears, a second hearing screening, also called re-screening, should be performed at the local maternal and child health hospital designated for this purpose 42 days after birth, after problems with the external auditory canal structure have been ruled out. If still unable to pass, the initial hearing screening and hearing confirmation will be performed again at three and six months of age.