The birth hair on infants usually falls off naturally after 2-3 weeks and can be completely shed in 3-6 months. Infant birth hair refers to a very fine layer of vellus hair that covers the body of a newborn after birth and is the final form of the later transformation into body hair. The native birth hair may fall out and grow again is the final sweat hair. Depending on the individual’s constitution and genetics, everyone has a different time to shed their birth hair. There is no need to intentionally shave or cut it off because the baby’s skin is delicate and easily damaged, which can cause skin inflammation and other infections. If there is too much birth hair on the baby, which affects heat dissipation or causes discomfort to the baby, you can take it to the pediatric department of the hospital and seek professional medical help. After birth, the infant can be properly supplemented with vitamin D to promote the absorption of calcium, and can also be properly given a hot compress on the abdomen and do abdominal massage to promote gastrointestinal peristalsis, while needing to pay attention to keep warm.