Babies can usually be screened for newborn diseases two days after birth, which may be related to hospital policy.
The best time to screen newborns for disease is 2-3 days after birth, and generally no later than 20 days. However, breastfeeding at least 6-8 times, due to the fact that if it is a failure to breastfeed sufficiently, it generally tends to result in a false-negative screening because the blood phenylalanine does not rise. The earlier the newborn is screened for a disease, the sooner various congenital genetic diseases can be ruled out or treated with early intervention.
Through a series of disease screenings after the birth of a newborn baby, the main tests include congenital hypothyroidism, phenylketonuria, congenital adrenocortical hyperplasia, and G6PD deficiency (also known as serosanguineous disease).
It is recommended that if you want to know the exact timing of newborn disease screening, you can check with your local hospital.