Fetal biparietal diameter refers to the length of the left and right sides of the fetal head, also known as the "transverse diameter of the head". Through this data, the development of the fetus can be observed, and it can be determined whether the mother can deliver smoothly when the due date arrives. So, how much does a child with a biparietal diameter of 8.1 weigh?
Generally speaking, it is impossible to predict the weight of a child solely based on the length of the biparietal diameter. The weight of a child needs to be calculated by the doctor based on the height of the uterus and abdominal circumference. As the gestational age increases, the fetus grows and the biparietal diameter also increases. Generally, biparietal diameter can be measured from the 12th week of pregnancy.
Statistically speaking, by 40 weeks of pregnancy, the majority of fetuses have a biparietal diameter of less than 10 centimeters. Medically, it is generally believed that infants with a biparietal diameter exceeding 10cm will make vaginal delivery more difficult. The statement that if the biparietal diameter exceeds 10cm, vaginal delivery cannot be performed is incorrect. The biparietal diameter is only one of the criteria for determining the smoothness of vaginal delivery, and it also depends on factors such as the child's abdominal circumference and the size of the mother's pelvis.
A fetal biparietal diameter that is too large may be due to poor development of the fetus, which is directly related to the mother's excessive intake of nutrients and insufficient exercise. It also indicates that the mother and fetus have sufficient nutrition, causing the child to develop too well. This is common in contemporary times, so there is no need to worry, as long as there are no abnormalities in the child's head, it can be reassuring. However, if the child's biparietal diameter is too large, the first consideration is hydrocephalus. It is recommended to pay attention to checking the child's brain during ultrasound to rule out the possibility of developmental abnormalities.
