Fetal leg length is generally determined by genetic factors, if the parents have long legs, the fetus will generally have long legs. Of course, if the mother’s malnutrition leads to a slightly slow development of the fetus, resulting in short legs at the time of the examination, you can promote the healthy development of the fetus by strengthening the mother’s diet and nutrition, which may have a promotional effect on the length of the fetus’s legs, mainly including the following foods: 1, calcium-containing foods: pregnant women can eat more calcium-rich foods, such as milk, soy products, lean meat, etc., which is conducive to the growth and development of the fetal bones. Pregnant women in the middle and late stages of pregnancy can be properly supplemented with calcium, while increasing outdoor activities, more sun exposure, can promote calcium absorption; 2, high protein food: protein is one of the main organic matter constituting the bones, pregnant women can eat an appropriate amount of high protein diet to promote fetal leg bone growth and development, common foods are eggs, nuts, chicken, animal liver, etc.; 3, food containing vitamin D: vitamin D can promote calcium absorption, can also prevent fetal rickets. Can also prevent the fetus from rickets, to avoid leg deformities. During pregnancy, you can add more fruits and vegetables rich in vitamin D, such as kiwi, amaranth, etc. The diet during pregnancy needs to be scientific and reasonable, with a comprehensive nutritional intake, not blindly consuming prescriptions. Pregnant women need to relax and avoid anxiety and tension affecting fetal development. Regular maternity checkups and timely treatment of abnormalities to ensure the normal development of the fetus.