The nutritional needs of women at each stage of pregnancy are different and need to be supplemented according to different stages, there are several cases as follows: 1, 2, in the middle of pregnancy need to supplement more iron-rich food, because in the middle of pregnancy, pregnant women and fetuses need more iron, if iron deficiency will cause anemia, so in the diet can eat more pig liver, egg yolk and other iron-rich food; 3, in the late pregnancy need to supplement more calcium, because in the late pregnancy is a critical period of fetal bone development, if calcium deficiency will lead to The fetus has congenital calcium deficiency.