Level 1: Nutritional products for pregnant women. Pregnancy is a critical period for fetal growth and development. Pregnant women need to take in enough nutrients to meet the needs of the fetus and themselves. Therefore, nutritional supplements for pregnant women have become a topic of great concern. 1. Folic acid Folic acid is a vitamin that pregnant women must supplement. It can effectively prevent fetal neural tube defects, such as spina bifida and other congenital malformations. It is recommended to start supplementing with folic acid in early pregnancy, with a daily intake of 400