Is the chance of a normal birth high if the biparietal diameter is 100?

If the biparietal diameter of the fetus reaches 100 during delivery, a normal birth is generally not possible, but the specific situation still depends on the physical condition of the pregnant woman. Generally speaking, if the biparietal diameter is 100, pregnant women may experience difficult labor, so caesarean section may be recommended for delivery, which is also for the pregnant woman and fetus to better prepare for delivery.

Can a normal birth be possible if the biparietal diameter exceeds 100?

If the biparietal diameter of the fetus reaches 98MM, normal delivery is generally not possible. Whether a normal birth is possible depends on the comprehensive coordination of various factors after entering the labor process, such as the descent of the fetus, the expansion of the mother's birth canal, her physical condition, mental state, and uterine contractions. If the biparietal diameter is larger than the transverse diameter of the pelvic outlet, it becomes a question whether the child can be delivered naturally. The final choice depends on the pregnant woman's pelvis and the size of the baby at full term. Therefore, it is difficult to give birth naturally if the biparietal diameter exceeds 100cm. The key factors for a normal birth are:

1. Birth canal

Bone birth canal: 8-9 cm, oval curved canal with two roadblocks in the middle (ischial spines) - fixed

Soft birth canal: a tortuous tube consisting of the lower uterine segment, cervix, vagina, and pelvic floor tissues—with fat

(ii) Fetus

The average biparietal diameter of the full-term fetus is 91 to 93 mm.

The narrowest meridian in the mother's pelvis is about 100 mm wide

Malposition of the fetus includes: breech position, transverse position, and malposition of the head

(III) Productivity

Refers to the contraction of the uterus, abdominal muscles, and levator ani muscles

There will be some false labor in the late pregnancy, usually 20 to 30 seconds, and at the time of labor, the longest is only about 45 seconds to one minute.

Prolonged uterine contractions may cause intrauterine hypoxia

(IV) Mentality

It plays a very critical role. You should be mentally prepared for natural birth or cesarean section before giving birth.

Can the biparietal diameter of femur length accurately determine the gender of the baby? The biparietal diameter is also called BPD, the biparietal diameter of the fetal head. It refers to the length of the widest part between the left and right sides of the fetal head, also known as the "greater transverse diameter of the head". Doctors often use it to observe the child's development and determine whether there is cephalopelvic disproportion and a smooth delivery.

At full term, the biparietal diameter of the fetus should reach 9.3 cm or more. According to general rules, after 5 months of pregnancy, the BPD is basically consistent with the month of pregnancy, that is, at 28 weeks of pregnancy (7 months) the BPD is about 7.0 cm, at 32 weeks of pregnancy (8 months) it is about 8.0 cm, and so on. After 8 months of pregnancy, an average weekly growth of about 0.2 cm is normal. When the due date cannot be determined by CRL in the early stage, BPD is often used to predict it; after the middle stage, this data is often also needed to be measured when estimating the fetal weight.

Experts remind: It is not scientific to use the biparietal diameter to determine whether the fetus is male or female. However, the biparietal diameter is used to calculate the fetal weight. The formula is: fetal weight = biparietal diameter * 900-5200 (g)

Femoral length (FL) is an indicator commonly used by doctors to observe fetal development when performing pregnancy examinations on pregnant women using B-ultrasound (or color ultrasound).

The femur and humerus are both typical long tubular bones in the human body, and can be divided into two ends. The femur is the largest long bone in the human body and refers to the thigh bone; the humerus is located in the upper arm and is also called the upper arm bone. So as the names suggest, femur length refers to the length of the thigh bone, and humerus length refers to the length of the upper arm bone.

Femur length and humerus length are both fetal biological indicators for predicting fetal weight. However, fetal humerus length is better than femur length in predicting fetal weight.

Experts remind: Using the length of the femur to determine whether the fetus is male or female is unscientific and has no basis.