The hug reflex is the most defensive reflex of infants. For infants under 3-4 months old, when the mother or family members suddenly walk to the child or make loud noises, they will find that the child has two arms that are abducted and straightened, and then flexed and received in front of the chest in the shape of hug, which is a physiological phenomenon, medically known as hug reflex. So how to prevent it? The prevention of neonatal brain injury is mainly in two pieces: the first one is the health care during pregnancy, which is done jointly by our neonatologists and obstetricians. After the seventh month of pregnancy, the fetus belongs to both of us, we take care of the fetus and the newborn, and the obstetrics department takes care of the mother and the fetus. Parents must go to a regular unit for follow-up pregnancy testing, this is very important, if you do not follow up, you do not know if the fetus is normal, when the oxygen deficiency, when the fetal gas is good. Now after the ultrasound is good, you will be able to avoid hypoxia through regular hospital prenatal checkups. Once there are some complications and critical conditions, go to a better hospital so that the measures to deal with them will be better and reduce hypoxia during the birth. After we are born, the main thing is to strengthen the care, do not let the small child fall and leave our vision. These are some preventive measures.