Will the biparietal diameter grow after the pelvis is in place?

Pregnancy check-ups are necessary during pregnancy. Some of the data obtained during the check-up are important reference data, which can determine whether the baby is developing well and whether the baby can be delivered successfully. Biparietal diameter is one of the important judgment data. So, can the fetus still be born after the fetal head enters the pelvis? Next, let’s learn more about it with the editor of Ban Ban.

Can the fetus still be born after the fetal head enters the pelvis?

Maybe there will be more. Doctors often use it to observe the growth and development of children, determine whether there is cephalopelvic disproportion, and complete the delivery of pregnant women. Using the fetal biparietal diameter to judge the growth size of a child is a piece of data with reference value.

What should I do if the fetus's biparietal diameter is too large?

The larger biparietal diameter of the fetus is a sign of the baby's larger growth, which is directly related to the good nutrition and low amount of exercise of the pregnant mother. It shows that the pregnant mother's nutrition is sufficient, which leads to the baby's larger growth. This is a more common phenomenon nowadays, so there is no need to worry. As long as there is no abnormality in the fetus's head, you can rest assured.

However, if the biparietal diameter of the fetus is too large, the first thing to consider is hydrocephalus. It is recommended to pay attention to checking the fetal head during B-ultrasound to eliminate the possibility of abnormal development of the child. At full term, the biparietal diameter of the fetus should be 9.3 cm or more. 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.

How to feel the fetal head when it enters the pelvis

Engagement in the pelvis is a necessary condition for the delivery of the fetus. If the fetus cannot engage in the pelvis or the engagement fails, it will affect the delivery of the pregnant woman. Moreover, because they understand the necessity of fetal engagement, many pregnant women in the later stages of pregnancy will determine whether the baby is engaged by touching their belly. So, how do you feel when the fetal head enters the pelvis?

The pregnant woman lies flat on her back, bends her legs, and touches the upper part of her vulva. If she can touch a hard area, it means the fetus has not yet entered the pelvis; if she cannot touch a hard area, it means the fetus has already entered the pelvis successfully.

If you go to the hospital to check whether the fetus is in the pelvis, the doctor will usually stretch out the ring fingers and thumbs of both hands and gently press the fetal head on the upper edge of the ischial tuberosity. If the fetal head can be shaken, it means that the fetus has not entered the pelvis; if the fetal head cannot be shaken, it means that the fetus has already entered the pelvis. Pregnant women should not use this method casually. Pressing the pregnant woman's belly incorrectly can easily cause accidents.

In addition, to determine whether the fetus has entered the pelvis, pregnant mothers can also observe and experience some physical symptoms to make it clear. If the abdomen seems to drop in the later stages of pregnancy, or if you feel your lower abdomen is falling or swollen and painful, it indicates that the fetal head has entered the pelvis.