The time of newborn disease screening, blood collection 3 days after birth for normal newborns; premature birth, ICU hospitalized newborns, the seventh day after birth; more serious conditions after birth, no breastfeeding, amino acid load, protein load, no more than 20 days to collect blood. Various reasons for early discharge, transfer, private clinics, no screening conditions recommended 72 hours after blood collection, such as the conditions are not available, need to do a good job of handing over to units equipped to do disease screening blood collection screening, recommended no more than 20 days, because the late screening time, it is difficult to detect disease.