During pregnancy, lying down to sleep with a protruding stomach is considered to be the fetal limbs in the uterine cavity activities caused by today is not normal, the fetus in the uterine cavity is normal activities, if you are worried about can do ultrasound or fetal heart monitoring to determine the situation, fetal heart fetal movement is normal can not worry about. During pregnancy, especially in the middle and late stages of pregnancy with the development of the fetus increases, fetal limbs in the uterine cavity activities will be more obvious, lying down to sleep and feel the stomach protruding is normal, but not every time there will be protruding, today there is no protrusion may also be normal. It is recommended to pay attention to rest during pregnancy, strengthen the nutritional balance, regular obstetric examination to determine the normal development of the fetus.