Left occipital anterior position is in the routine obstetric examination, the back of the child’s head in close to the left side of the abdominal wall position, and the overall fetal back in the mother’s left side of the anterior abdominal wall, basically this is the state. In fact, whether it is left occipital anterior position or right occipital anterior position, in pregnancy are advocated to take the left side of the mother-to-be as far as possible, if you really do not like the left side of the position, may affect the sleep, you can also take the right side of the position, but do not recommend the flat position. Because of the flat position when the whole body’s blood circulation may be increased by the uterus and the fetus pressure to the inferior vena cava, resulting in poor blood return, easy to cause the mother-to-be positional hypotension, also known as supine hypotension syndrome, a drop in blood pressure is particularly serious may lead to insufficient blood supply to the placenta, resulting in placenta abruption. Therefore, during pregnancy to promote the left side of the lying position, really can not also take the right side of the lying position.