Neural tube abnormality is a congenital abnormality that can be prevented in babies by taking a certain amount of folic acid supplements during pregnancy, which can be detected by color ultrasound. Ultrasound can observe the growth and development of the fetus more accurately, especially 3D ultrasound, which identifies the six major fetal malformations. How to avoid fetal neural tube abnormality when pregnant, take adequate amount of folic acid in the first trimester of pregnancy. During pregnancy, you should eat more fresh vegetables, fruits, lean meat and egg-based foods for food source folic acid supplementation. Compared with drugs, food supplementation of folic acid is more safe and reliable, and you should maintain good lifestyle habits during pregnancy, not smoking, not staying up late, eating less spicy food, controlling weight, avoiding excessive obesity, and controlling blood sugar, blood lipid and blood pressure levels. During pregnancy, you should strictly follow the time of maternity check-ups and have regular maternity check-ups, and you should strictly implement all the items examined.