During the entire pregnancy, expectant mothers will need to undergo some prenatal check ups. These projects are aimed at better understanding the situation of expectant mothers and babies. The biparietal diameter of the fetus is a common indicator, and its standards may vary at different stages of pregnancy. Let's learn about the biparietal diameter standard for fetuses at 40 weeks of gestation together, hoping to help everyone solve their confusion.
The average biparietal diameter at 40 weeks is 9.28 ± 0.50, the average abdominal circumference is 31.49 ± 2.79, and the average femur length is 7.4 ± 0.53.
Double apical diameter, also known as BPD, is the twin apical 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 "head transverse diameter". Doctors often use it to observe the development of children, determine whether there is a head and pelvis imbalance, and ensure a smooth delivery.
At full-term pregnancy, it should reach 9.3 centimeters or more. According to the general rule, after 5 months of pregnancy, the BPD basically matches the month of pregnancy, which means that at 28 weeks (7 months) of pregnancy, the BPD is about 7.0 centimeters, at 32 weeks (8 months), it is about 8.0 centimeters, and so on. After 8 months of pregnancy, an average weekly growth of about 0.2 centimeters is considered normal. When the expected production date cannot be determined through CRL in the initial stage, it is often predicted through BPD. After the mid-term, when estimating fetal weight, it is often necessary to measure this data.
The biparietal diameter of the fetus is also directly related to its nutritional status. If the biparietal diameter is too small, it cannot be ruled out that irregular menstruation, inaccurate gestational age, or measurement errors in ultrasound may cause it. If no obvious developmental abnormalities are observed, there is no need to worry too much. It is recommended to pay attention to the regularity of daily life and diet, strengthen nutrition in daily life, eat more high protein foods, and undergo regular physical examinations.
Throughout the entire pregnancy process, expectant mothers should increase their intake of nutrients by eating small meals and frequent meals. A diet that requires exercise is very beneficial for both the mother and the baby. Because each baby's growth and development situation is different, when the baby's growth data is not within the standard range, expectant mothers should not panic too much, as long as the baby is growing up healthy.
