Pregnancy 29 weeks biparietal diameter to determine the gender

During pregnancy, the growth and development of the fetus in the mother's body has scientific regulations. The growth and development of the fetus is different at different time stages. This is of great guiding significance for us to identify the gender of the fetus. We must give scientific understanding. So, is it accurate to measure the gender of the fetus by the biparietal diameter at 29 weeks of pregnancy?

1. Can the ultrasound data at 29 weeks of pregnancy determine the gender of the baby?

The ultrasound data at 29 weeks of pregnancy cannot tell whether the baby is a man or a woman. At 29 weeks of gestation, the mean biparietal diameter of the fetus was 7.50 ± 0.65, the mean abdominal circumference of the fetus was 23.71 ± 1.50, and the mean femur length of the fetus was 5.61 ± 0.44. Generally speaking, the data in the B-ultrasound report include fetal biparietal diameter, fetal abdominal circumference, fetal femur length, gestational sac, fetal heart rate, etc. The embryo, amniotic fluid, fetal umbilical cord, fetal spine, etc. can also be observed from the B-ultrasound. The state strictly prohibits the identification and assessment of fetal sex in non-medical fields, and ultrasound doctors have no obligation to determine the sex of the fetus. Therefore, there is no reminder of gender information on the examination report. It is widely believed that the gender of a baby can be determined from the gestational sac in B-ultrasound data, but there is actually no scientific evidence to support this.

The shape and size of the fetal sac is determined by many factors, including pregnancy duration, nutrition, embryo implantation site, and uterine cavity size. The uterine cavity of each pregnant mother is different, and the shape of the gestational sac will of course vary with the shape of the uterine cavity, and it is also related to the situation when the pregnant woman is examined. For example, some pregnant women hold their urine for a long time, so their uterus is flattened, and the shape of the gestational sac also looks flatter.

In addition, for some pregnant women, the sperm and egg embryo implantation site is correct, while for others it is more biased, resulting in different shapes of the gestational sac. Therefore, from the B-ultrasound data, looking at the shape and size of the gestational sac to determine the sex of the fetus is a term widely circulated by the older generation. Pregnant mothers do not need to take it too seriously. Generally, except for the direct display of the fetal reproductive organs in the B-ultrasound, other folk terms are only for reference.

2. Data content of each aspect of B-ultrasound report

1. Gestational sac: The gestational sac is only seen in the early stages of pregnancy. Its size is 2 cm in diameter at 1.5 months of pregnancy and about 5 cm at 2.5 months, which is normal. The location of the gestational sac in the fundus, anterior wall, posterior wall, upper end, and middle of the uterus are all normal. Circular, oval and clear shapes are normal. If the gestational sac is irregular in shape, unclear, and located at the bottom, and the pregnant woman also has abdominal pain or vaginal bleeding, she may have a miscarriage.

2. Fetal head position: The outline is normal, damage and deformation are abnormal, and there is no movement of the brain center line and no hydrocephalus. BPD means the biparietal diameter of the fetal head, which should be 9.3 cm or more when the pregnancy reaches full term. According to general regularity, after the fifth month of pregnancy, it is basically consistent with the pregnancy phase. In other words, the BPD is about 7.0 cm at the 28th week of pregnancy (7th month), about 8.0 cm at the 32nd week of pregnancy (8th month), and so on. After the eighth month of pregnancy, an average increase of about 0.2 cm per week is normal.

3. Fetal heartbeat: if present and strong, everything is normal; if absent and weak, there is an abnormality. The normal fetal heart rate is between 120-160 beats per minute.

4. Fetal movement: If it is strong, it is normal. If it is weak, it may be that the fetus is sleeping. It may also be abnormal and needs to be analyzed comprehensively in combination with other items.

5. Embryo: The location indicates the location of the embryo in the endometrium. The normal thickness of the embryo should be between 2.5 and 5 cm. Thickening is divided into grade III on the examination report. Grade I is the early stage of placental maturation, with uniform echoes. This change can be seen at 30-32 weeks of pregnancy. Grade II indicates that the embryo is close to perfection. Level III indicates that the embryo is already mature. The closer to full term, the more perfect the embryo is and the more uneven the echo is.