There are many risk factors that can cause cerebral palsy, and ultra-low birth weight infants are the most likely risk factor for cerebral palsy. 1. What are the factors that cause ultra-low birth weight babies? Hyperemesis, placenta abruptio or placenta praevia, twin or multiple births, maternal and child blood type incompatibility, intrauterine infection, premature rupture of membranes, uterine malformation, etc. 2.What are the risks of ultra-low weight? Due to the immaturity of the organs, ultra low weight babies will face the following difficulties after birth: firstly, the respiratory system will show asphyxia, apnea, RDS, pneumonia, pulmonary hemorrhage and respiratory failure. The second manifestation is anemia, hyperbilirubinemia, intracranial hemorrhage, hypoxic encephalopathy, the gastrointestinal tract is also prone to acute necrotizing small intestinal colitis, infections, especially infections can be at any stage of development in preterm infants and can be fatal. Finally, attention should also be paid to fluctuations in blood sugar, sclerosis and retinopathy and cerebral palsy. 3. How to avoid the emergence of ultra-low weight babies? As a pregnant woman, you must actively participate in perinatal health care, learn something about perinatal health care and develop good habits. As an obstetrician, we should try our best to ensure the healthy growth of the fetus during pregnancy care. In addition to using medical means to intervene in preterm abortion, it is more important to provide health education so that pregnant women can learn how to reduce the factors that trigger preterm birth and work from the perspective of prevention, which will receive better results. As a pediatrician, we should ensure the survival of the born preterm infants for their different maturity levels and corresponding complications, and try to reduce the occurrence of sequelae, and if they are left, we should choose the appropriate program to promote their recovery.