1. Insufficient oxygen supply: When a pregnant woman sleeps on her stomach, the uterus will press the great blood vessels in the abdomen and hinder blood circulation, thus reducing the chances for the fetus to get oxygen and nutrition. This may lead to fetal dysplasia or hypoxia.
2. Increased pressure: Sleeping on your stomach will bring extra pressure to the uterus, which may have a negative impact on the development of the fetus. Especially in the third trimester, the uterus is already quite heavy, and sleeping on your stomach may increase the risk of uterine prolapse.
3. Abnormal placenta position: Sleeping on your stomach may increase the risk of abnormal placenta position, such as placenta previa or placental abruption. These conditions may lead to severe bleeding and other complications.
For the above reasons, I suggest pregnant women try to avoid sleeping on their stomachs. Instead, they should choose to sleep on their side, especially on their left side. This posture helps to maintain good blood circulation, provide enough oxygen and nutrition for the fetus, and reduce the oppression of the uterus on the abdominal blood vessels.
However, every pregnant woman's situation is unique. If you have any questions about sleeping posture or other health problems, please consult your doctor for personalized advice.