What do you mean by the length of the top buttock? What is the length of the top buttock?

1, buttock length refers to the length from the highest point of fetal head and neck to the lowest point of fetal buttock, which is an important index to evaluate fetal physical development. Before the 7th-12nd week of pregnancy, the fetal physical development was evaluated mainly by measuring the fetal parietal bone diameter. If the hip diameter is consistent with the actual gestational age, it means that the fetal body development speed is normal.

2. If the length of hip diameter is obviously less than the normal reference value of actual gestational age, it means that the baby's physical development speed is relatively slow, which may be caused by insufficient intake of various nutrients during pregnancy, or it may be that pregnant women have some serious pregnancy complications, such as hypothyroidism and severe anemia, which affect the fetal physical development. If there is no accurate number of gestational weeks, the approximate gestational weeks can also be inferred by measuring the length of fetal parietal diameter.