Malnutrition during pregnancy can lead to fetal growth restriction, such as affecting fetal intelligence, physical development, brain development, etc. Malnutrition during pregnancy mainly includes: protein deficiency may cause fetal brain development; if it is a certain vitamin deficiency, it may lead to fetal malformation, such as folic acid deficiency may affect neural tube development or cleft lip, cleft palate, etc.; micronutrient deficiency, such as calcium deficiency may affect fetal growth and development, etc. Even insufficient nutritional intake during pregnancy may lead to fetal miscarriage, premature birth, low birth weight babies, etc.