The fetal movement is more frequent when lying than sitting, which may be related to the change of pregnant woman’s position, but also does not exclude that it may be a self-perception error, in addition to the need to consider intrauterine hypoxia, uterine cavity volume changes and other factors. 1, position change: because the pregnant woman’s position changes, the fetal position will follow the change. If the fetus is not used to the changed posture, it will adjust itself, and when adjusting, the pregnant woman will feel fetal movement, which is normal for a short period of time; 2, self-perception: it may be due to not paying too much attention to fetal movement when sitting, but when lying down, the attention is shifted to the abdomen, and the fetal movement is felt frequently; 3, intrauterine hypoxia: the volume of the uterus increases in late pregnancy, and the inferior vena cava is compressed when lying down, which affects the amount of cardiac blood return for a longer period of time. Longer, easy to cause intrauterine hypoxia, fetal movement abnormal increase, it is recommended that the left side lying position. When the fetal movement is frequent, pay attention to the fetal movement count or go to the hospital for fetal heart monitoring to see if it is frequent within the normal range of fetal movement or abnormal due to other reasons such as hypoxia. Avoid sitting and lying for a long time during pregnancy, it is not recommended to keep the same position for too long, so as not to affect the blood circulation of the whole body, which is not conducive to the growth and development of the fetus.