Baby transverse position in the middle of pregnancy is actually a normal fetal position. In the middle of pregnancy, because the amniotic fluid volume is relatively high and the fetus is relatively small, the fetus has a very large range and amplitude of movement within the uterine cavity, so he can move freely inside, and at this time, what kind of position the fetus adopts is possible, it may be cephalic or breech, or it may be transverse position that is shown in the process of transferring from cephalic to breech position. So in the mid-pregnancy, that is, when ultrasound is done in the twenties, many women will show that the fetus is in a transverse position, and there is nothing to worry about. This is because the transverse presentation is just a transitional phase, and the vast majority of fetuses switch to longitudinal delivery, that is, to cephalic or to breech, in the later stages of pregnancy. Of course, the most common position is the cephalic position, because the head is the heaviest part of the fetus, so by gravity, the majority of fetuses will take the head down position into the pelvis, so the cephalic position is the most common, and only a very small number of cases are still in the transverse position in the late stage of gestation, which is often due to the uterus has deformities or uterine fibroid tumors, which leads to the obstruction of fetal rotation of the fetal position, or there is anterior placenta and other factors, which may affect the fetal position, but also may affect the fetal position. This is often due to uterine anomalies or fibroids that prevent the fetus from rotating in the fetal position, or placenta previa.