A pregnant woman in her fourth month should be nutritionally well-matched, avoid partiality, eat foods rich in protein, vitamins and fiber, and increase the number of staple foods. Nutrition is very important for pregnant women in the fourth month, from which the fetus will grow and develop rapidly, and needs to be supplemented with a large amount of nutrients to meet the physical needs of the mother and fetus. 1. Protein: pregnant women need adequate protein, high-quality protein is an important part of the composition of fetal organs, pregnant women should be supplemented every day with animal and plant proteins, such as lean meat, eggs, fish, soybean products, milk and so on. 2. Fiber and vitamins: some pregnant women will be constipated during pregnancy, so it is recommended to increase the intake of fiber, you can eat some fresh fruits and vegetables, such as tomatoes, carrots, celery, corn, etc., to prevent constipation at the same time you can add vitamins. 3. staple food: four months pregnant, but also to increase the intake of staple food, to ensure the supply of energy, to adapt to the rapid growth of the fetus, can be eaten with miscellaneous grains, such as millet, oats and so on. However, it should be noted that, during pregnancy can not be excessive supplementation of nutrients, easy to lead to fetal growth is too large, into a huge child, pregnant women are also prone to gestational diabetes.