Is the biparietal diameter of a baby over 9.8cm suitable for normal delivery or caesarean section? How big is the biparietal diameter of a baby for normal delivery?

We all know that after a woman becomes pregnant, the development of the fetus is different. Some fetuses develop more normally, some develop faster, and some fetuses develop slower, etc. The biparietal diameter of the fetus will directly affect the birth of the baby. So, how much biparietal diameter of the fetus can be used for normal delivery? Let’s take a closer look below!

What is the biparietal diameter of the fetus before delivery?

How long is the biparietal diameter of the fetus before delivery? This question is a bit interesting. There is no direct relationship between the size of the fetus and the size of the biparietal diameter. Some fetuses have a biparietal diameter of 93mm at 36 weeks, but the fetus is not mature yet, so it will not be born yet. Some fetuses are already full term, but the biparietal diameter It is only 90mm. You cannot let the fetus' biparietal diameter grow to 93mm before birth. In short, as long as the fetus matures, labor will occur naturally. It is not necessarily related to the biparietal diameter of the fetus. However, according to the growth law of the fetus, the biparietal diameter should reach at least 93mm by the time the fetus is full term. Of course, if it does not reach 93mm, it does not mean that there is a problem with the fetus. The size of the fetus's biparietal diameter is related to genetic relationships, fetal nutrition, gestational age, etc. In other words, the fetus is delivered at term at 38-42 weeks of pregnancy, but the biparietal diameter of the fetus is not fixed at the time of delivery. It may be 90mm or 101mm.

How much does the biparietal diameter exceed to prevent normal delivery

Normally speaking, it is best not to exceed 9.8cm in the biparietal diameter of the fetus. As long as the fetus’ head can pass through the birth canal, the body can naturally pass through it, so the biparietal diameter of the fetus can also determine the mode of delivery. Because the narrowest part of the pelvis of most pregnant mothers is only 10cm. In comparison, of course, the smaller the biparietal diameter, the easier it is to give birth naturally. If the biparietal diameter is too large, it will lead to cephalopelvic disproportion and the fetus will not be able to enter the pelvis. Even if the fetus does enter the pelvis, it will be stuck in the birth canal due to the excessive biparietal diameter. Even if it can pass through in the end, the whole process is quite difficult. After the fetus leaves the pelvis, it has to pass through the soft birth canal, that is, the perineal opening. If the pregnant mother has poor conditions, poor elasticity, poor development, etc., it will also cause certain resistance to the fetus, causing the fetus to stay in the birth canal for too long, which can easily cause fetal hypoxia.

However, some fetuses with a relatively large biparietal diameter can deliver successfully. This is because the pregnant mother's pelvis is relatively large and wide, which is more conducive to the smooth passage of the fetus.

Before giving birth, pregnant mothers will usually have another B-ultrasound. The doctor will also measure the mother's pelvis based on the results of this B-ultrasound to determine whether the mother is suitable for natural delivery.

What should pregnant women do if they want to give birth

Careful prenatal check-up

In order to further improve the success rate of normal delivery, the first priority for pregnant women is to take careful prenatal check-ups and actively treat pregnancy-related diseases or complications. The second most important thing is to actively control your own weight and fetal weight, mainly through scientific diet and appropriate exercise.

Scientific diet

The so-called scientific diet refers to actively supplementing nutrients, including folic acid and a variety of vitamins and minerals. Starting to supplement calcium during the second trimester, eating a balanced diet, eating more fresh vegetables and fruits, eating more high-protein foods such as lean meat, eggs, fish and shrimp, and appropriately reducing high-sugar, high-salt and high-fat foods.

Reasonable exercise

Appropriate exercise means that the amount of exercise should be moderate, without feeling tired during exercise, and without affecting normal life after exercise; it should be moderate, maintaining a similar amount of exercise every day, not increasing or decreasing suddenly, and the range of exercise should be smaller; it should be appropriate, choosing exercises that suit your physical condition and venue conditions, and it is best to take into account both strength and endurance.