1. The necessity of nutritional supplements for pregnant women. During pregnancy, fetal development requires a large amount of nutrients, and pregnant women themselves also need more nutrients to maintain body functions and support the growth of the fetus. Therefore, proper supplementation of nutritional supplements for pregnant women can help pregnant women meet their body needs and ensure the healthy development of the fetus. 2. Common types of nutrition for pregnant women 1. Folic acid: Folic acid is used to prevent miscarriage