What is the normal value of head circumference at 33 weeks?

During pregnancy, the doctor will use color Doppler ultrasound to measure the fetal head circumference. It is very important to measure the fetal head circumference. It can not only observe whether the growth and development of the fetus is good, but also the size of the fetal head circumference is related to the different delivery methods chosen by pregnant women. So what is the standard fetal head circumference at 33 weeks? What should I do if the fetal head circumference is too small or slightly larger?

33 weeks fetal head circumference standard

The growth and development of the fetus at 33 weeks is as follows: the average fetal length is about 41.5 cm, the fetal weight is about 2 kg, the fetal head circumference is about 29.8 cm, the average biparietal diameter is 8.50 ± 0.47 cm, the average abdominal circumference is 27.78 ± 2.30 cm, and the length of the femoral head is 6.42 ± 0.46 cm. The data within this range are all normal ranges.

What should I do if the fetus's head circumference is too small or slightly too large?

1. The fetal head circumference is small. It is okay if the fetus is one to two weeks smaller. It is normal and pregnant mothers do not need to worry. Generally speaking, doctors will advise you to pay attention to rest, avoid excessive fatigue, and eat more nutritious foods to promote the growth of the fetus. However, you should be careful not to increase your weight too much in a short period of time, as this will be detrimental to the choice of natural delivery. Therefore, it is not suitable for pregnant mothers to supplement too much or too much nutrients.

2. The fetal head circumference is relatively large. When the fetal head circumference is within the normal range, there is generally no big problem. After all, the B-ultrasound data is somewhat different from reality, and the different postures of the fetus will also affect the B-ultrasound data. If the doctor does not mention any problems, then continue to adjust as normal and remember to do regular prenatal checkups. However, if you want to choose a natural birth, the biparietal diameter of the fetus must be less than 10cm. Otherwise the only option is a caesarean section. B-ultrasound can examine the fetus's head to check whether there is water in the fetus's head. If so, treatment measures must be taken immediately.

Generally speaking, the development of each fetus is different, so if the fetal head circumference is slightly smaller or larger, as long as it is within the normal range, there is no need to worry too much. However, if the fetal head circumference is too large or too small, it will be detrimental to the delivery of pregnant women and the health of the fetus, and it is better to treat it as soon as possible.