Several conditions of abnormal fetal position during pregnancy

　　Occipital anterior position:

　　we know, Uterus within fetus It is soaked in amniotic fluid. Since the fetal head is heavier than the fetus, most of the fetuses are below the head and above the buttocks. The normal fetal position is not only head down, but also with the fetal head flexed, with the occipital bone in front, in a prone position. During delivery, the occiput is the first to enter the pelvis. It is medically called "occipitoanterior position", which is also commonly known as "tummy birth". This fetal position is the normal fetal position, and delivery is generally smooth. During delivery, the fetal head passes through the birth canal with the smallest circumference, and the mother and fetus are least likely to be harmed. Deliveries in normal fetal position account for about 94% to 95% of deliveries.

　　Breech position:

　　Abnormal fetal position means that in addition to the normal position and posture mentioned above, everything should be regarded as abnormal fetal position. But what we usually call fetal malposition refers to abnormal position, that is, fetal position in a non-cephalic position, including breech position and transverse position. Breech position is the most common, accounting for 3% to 4% of the total number of births. That is, the fetus is in a position below the buttocks and on the head, which is not conducive to delivery and often requires a cesarean section.

　　Head position dystocia:

　　Abnormal fetal posture is often unfamiliar to expectant mothers, but its incidence is much higher than abnormal position, accounting for 20% to 30%. However, abnormal posture is variable. As the labor progresses, under the influence of labor force or the handling of midwives, it can be transformed into a normal fetal position and a successful delivery. Only 2% to 3% of them cannot be transformed into a normal fetal position and require assisted delivery or cesarean section. We call it cephalic dystocia.