When pregnant women are about to give birth, they will have a bone opening seam, and the joint at the back of the pregnant woman's pelvis will split on both sides. When the baby is born, both the bone seam and the vaginal opening will crack, so it is very painful for women to have another baby. So how many bone seams can pregnant women open to produce?
 1. Bone opening suture is only an operative term to measure whether a baby can be born smoothly. It is a measurement method rather than bone cracking. The so-called bone opening suture is actually what people call "open ten fingers". The so-called open ten fingers are not the width of ten fingers, but the width of 10 cm, called "open ten fingers", also called "open ten fingers". Bone opening suture is also called uterine opening suture, which refers to the process of slowly opening the uterine orifice to about 10 cm.
 2. When a pregnant woman is about to give birth, her uterus begins to shrink until the bone seam is fully opened. Generally speaking, it takes a longer time for a pregnant woman to give birth for the first time, but it will take a shorter time for a pregnant woman who has experienced childbirth. This is because the cervix of a pregnant woman who has given birth for the first time needs to be flattened before her uterine orifice can be expanded. For pregnant women who have experienced childbirth, the cervical flattening and dilation of the uterine orifice are carried out at the same time, so the time of pregnant women who have experienced childbirth will be shorter.
 3. Pregnant women should try to relax when they are about to give birth, and if they want to have a smooth birth before giving birth, they should take more proper exercise. They can take more walks or climb stairs, but they need to be accompanied by their families to prevent pregnant women from giving birth suddenly. Pregnant women should try not to have too much emotional ups and downs before giving birth.