Feeling fetal movement when lying down at 20 weeks of pregnancy does not mean that the amniotic fluid is low. The reason why pregnant women feel fetal movement when lying down is because the posture of the fetus will also change when lying down, thus inducing fetal movement. In addition, the abdomen is flatter after lying down than standing up, so it may be more sensitive to fetal movement, and the fetus will move consciously. Fetal movement caused by low amniotic fluid, most of them will have a sudden and obvious increase in the number of fetal movements or a sudden decrease in the number of fetal movements compared to the usual, but it has nothing to do with the resting position, and it will not be changed even if you lie down. 20 weeks pregnant lying down with fetal movement, does not mean that the amniotic fluid is low, but may also be the normal activities of the fetus, pay attention to regular ultrasound monitoring, you can visually see whether the amount of amniotic fluid is reduced or increased, there are abnormalities can be intervened as soon as possible.