The fetus is basically stable in the third month or so of pregnancy, and the fetus has developed and entered a stage of rapid growth. At this time, the placenta arises and is able to secrete a series of hormones to ensure the healthy development of the fetus. Some pregnant women in early pregnancy have miscarriages due to insufficient progesterone, but the placenta produces and is able to secrete enough progesterone, thus making the development of the fetus more stable. Pregnant women 3 months pregnant after the fetus into a stable period, but still can not relax vigilance, daily habits need to pay attention to, such as pregnant women can not be strenuous exercise, lifting heavy objects, staying up all night, etc., pregnant women in early pregnancy pregnancy reaction is also gradually disappearing, the diet of meat and vegetables can be supplemented with nutrition in a timely manner to help the growth and development of the fetus, the physical conditions of pregnant women can be allowed to the case of appropriate outdoor activities.