【Abstract】: Folic acid is an indispensable substance for the rapid growth and development of the fetus. A large amount of clinical data shows that folic acid deficiency is one of the important causes of miscarriage, stillbirth and stillbirth in pregnant women, and is also the main cause of lifelong disability in children. Many women attach great importance to folic acid supplementation to prevent birth defects, but obstetricians find that many women make mistakes. Folic acid is an indispensable substance for the rapid growth and development of the fetus. A large amount of clinical data shows that folic acid deficiency is one of the important causes of miscarriage, stillbirth, and stillbirth in pregnant women, and is also the main cause of lifelong disability in children. Many women are very heavy