The incidence of neonatal hypothyroidism, both sporadic and endemic. Endemic hypothyroidism is caused by local iodine deficiency and has been reduced by universal screening or the use of iodized salt. Sporadic hypothyroidism is more common, with a national average incidence of 1/4000-1/5000, accounting for 70%-85% of the rate of neonatal hypothyroidism. Information from Shenzhen shows that from 2005 to 2007, through the tracing of 190,230 cases of newborns, 97 confirmed cases were found, with a prevalence rate close to 0.05%. For clinically suspected cases, it is recommended to prevent, treat and review according to medical prescriptions. Missing the chance of treatment can cause dwarfism and cretinism, which affect intelligence and height, and are irreversible.