Abnormal fetal position The position of the fetus in the uterus is called fetal position. The transverse oval shape of the uterus is one of the bases for the diagnosis of transverse fetal position. Transverse position is a kind of fetal position abnormality, the fetus lying in the uterus accounts for about 0.25% of the total number of deliveries and is called transverse fetal position. From the medical point of view, it means that the longitudinal axis of the fetus is at right angles to the longitudinal axis of the mother, which is a kind of fetal position and does not mean that it is pathological, but it is a more dangerous fetal position. Sometimes the longitudinal axis of the fetus is not exactly perpendicular to the longitudinal axis of the mother and becomes an acute angle or oblique position, which is called oblique position. The fetal body lies transversely above the pelvic inlet, with the first dewlap on the shoulder, the fetal head on one side of the mother and the buttocks on the other side, which may be temporary and eventually turns into a longitudinal or transverse position. The transverse oval shape of the uterus mostly occurs in cases of obstructed fetal head articulation, such as pelvic stenosis, placenta praevia or excessive fetal range of motion (e.g., transmaternal with loose abdominal walls, twin pregnancies, excessive amniotic fluid). The causes of transverse oval shape of the uterus are: 1. The abdominal wall is too flaccid and loose Transverse position mostly occurs in women who are in labor, because the abdominal wall is loose and the fetal position is variable, resulting in transverse fetal position. 2. 2, too much amniotic fluid is often complicated by fetal malformations. The fetus in amniotic fluid is in a head-down hip-up position because the head is heavier than the body. The normal fetal position is that the fetal head is bent down and the occipital bone is in front, called the occipital anterior position; the fetus is lying in the uterine cavity, called the transverse position; the buttocks are below and sitting in the uterine cavity, called the breech position. Both transverse and breech positions are fetal malposition. Even if the fetal head is downward, but the fetal head is changed from a downward curve to a supine extension or the occipital bone is in the back, it is also a fetal malposition. If the fetal head is not in the right position, we should try to correct it. About 20% to 50% of pregnant women with excessive amniotic fluid are combined with fetal malformations, among which the central nervous system and upper gastrointestinal tract malformations are the most common. In anencephaly, brain expansion and spina bifida fetuses, the cerebrospinal membrane is exposed, the choroidal tissue proliferates, and the exudate increases, resulting in excessive amniotic fluid. 3. Preterm infants are not yet full-term fetuses and have not yet turned head down. Uterine tumor, pelvic tumor, etc. impede the longitudinal axis of fetal body parallel to the mother and fetal head articulation. 4.Uterine malformation The fetal head is round and cannot be fixed, the entry into the pelvis is obstructed, and the uterus is non-elliptical, such as double uterus, saddle-shaped uterus, etc., which can easily lead to the transverse position of the fetus. 5, pelvic narrow prenatal pelvic measurement into the caliber line is small, or primigravida close to the prenatal period and the fetal head does not enter the pelvis. 6, abnormal umbilical cord The umbilical cord is too long, the fetus is prone to umbilical cord around the neck, winding limbs, etc. 7.Other factors such as multiple pregnancy, placenta praevia or lower uterine posterior placenta can lead to transverse and lateral position of the fetus.