From a scientific point of view, there is no strict time limit for newborns to have their hair cut. If the hair is long after birth, you can have a haircut 2-3 days after birth, use special haircutting tools for babies, pay attention to good sterilization, gentle movements, do not cut hair when the baby is crying, and the first haircut should not be too short. The traditional concept that haircuts can only be performed after the full moon has no scientific basis. If the weather is cold, haircuts can be performed after 3 months. There is no strict limit to the specific haircutting time for newborns, you need to choose the time with the specific situation of the child, pay attention to safety and hygiene.