The yellow color of the newborn baby is normal for 2-3 days after birth, will reach the peak in 4-6 days, and will slowly fade to normal in 7-10 days, which belongs to a normal physiological jaundice. If the child is a low birth weight baby or preterm baby, the jaundice time will be prolonged, but also belong to the normal phenomenon, preterm babies usually within 4 weeks will subside, if it still does not subside, you can go to the hospital to consult the doctor, laboratory tests to see if it is pathologic jaundice, 60%-80% of the full-term babies will appear jaundice. Jaundice can be found on the face and neck, so don’t be overly concerned.