Newborn screening mainly includes congenital hypothyroidism, phenylketonuria and hearing screening, and if the screening is abnormal, it is more critical and immediate medical attention is recommended. Screening is usually done with plantar blood. If thyroid function screening is abnormal, thyroid function can be rechecked with venous blood if necessary, and if hypothyroidism is still considered to be present, specialist care should be sought. Phenylketonuria is an autosomal recessive disorder, which can be characterized by growth retardation, mental retardation, and lightening of hair, etc. If abnormalities are detected in the newborn period, early diagnosis and treatment should be carried out so as to avoid affecting intellectual development. Abnormal hearing screening can be repeated at 30 or 42 days of age, if still not passed, the hearing can be repeated at 2 months, if still not passed, can further improve the examination to clarify the cause of hearing abnormality. Consult your physician for more information.