The weight of a pregnant woman at the beginning of pregnancy will not become heavier because the gestational sac is very small at the beginning of pregnancy, and the uterus does not show obvious changes, and the body shape will not change, so the weight will not be directly affected. Generally, the body shape and uterus will change after the third month of pregnancy, and the weight will gradually increase, and the longer the pregnancy, the heavier the weight will be, which is a normal physiological phenomenon. Therefore, in addition to eating more vegetables, fruits, grains and cereals in the middle and late stages of conception, you need to add proper nutrition, eat more meat, soy products, milk, fish and shrimp, etc. And you should supplement folic acid in the first trimester of pregnancy to prevent fetal neural tube malformation. In addition, it should be noted that sexual intercourse should be prohibited in the first trimester and the second trimester, and regular pregnancy checkups should be carried out, and Down’s syndrome screening should be carried out between 16 and 20 weeks of pregnancy, in addition to routine blood, trace elements, liver function, kidney function, blood sugar and other auxiliary tests.