In the second trimester, in addition to meeting the needs of fetal growth and development, pregnant women and fetuses have to store some nutrients in their bodies. As the demand for nutrients increases, it is necessary to increase the number of meals and the amount of food eaten daily so that the various nutrients and energy in the diet can meet the needs of pregnant women and fetuses. 1.Supplement adequate amount of calcium. The need for calcium increases significantly in late pregnancy, because the fetus needs a lot of calcium for teeth and bone calcification. 4, eat more carp, carp, radish and winter melon to help relieve edema symptoms; 5, eat more walnuts, sesame and peanuts and other foods rich in unsaturated fatty acids, as well as chicken, fish and other foods that are easy to digest and absorb and rich in protein; 6, eat more celery and lettuce and other foods rich in vitamins and minerals; 7, eat more foods rich in iodine, such as kelp, etc.