The size of the biparietal diameter is important for judging the development of the baby, especially after late pregnancy. The size of the biparietal diameter is not only related to whether the baby's development is normal, but also directly related to whether the baby can give birth naturally. So, will the baby's biparietal diameter still grow after 39 weeks?
As we all know, the due date for babies is usually calculated based on 40 weeks. As long as the baby's weight is increasing, their biparietal diameter will also change. Therefore, after 39 weeks, the baby's biparietal diameter will continue to increase. If the biparietal diameter is too large, it will affect vaginal delivery. After late pregnancy, it is important to control the weight of the pregnant woman and the growth of the fetus appropriately.
The biparietal diameter of the fetus is the main basis for doctors to determine the size of the fetus. In fact, the biparietal diameter of the fetus represents the largest cross-section of the fetus. When doing B-ultrasound, it is possible to visually measure the size of the biparietal diameter, but due to fetal posture, there may be some errors.
A full-term fetus with a biparietal diameter of around 90 millimeters is considered normal. If the biparietal diameter is too small, it indicates slow fetal development. Of course, if it's twins, it's normal for the biparietal diameter to be smaller. If the biparietal diameter is too large, exceeding 100 millimeters, the fetus generally cannot pass through the narrowest part of the pelvis smoothly, and the possibility of natural delivery is almost very small.
