It is difficult to know by yourself how the opening of the bony suture is, it requires a specialized doctor to know how dilated the uterine opening is through an internal examination. It is not something you can know on your own. If there is regular abdominal pain. Intervals of five or six minutes, pain for one or two minutes, such regular contractions, then it means that the mouth of the uterus is dilating and opening. Medical talk about the opening of the bones is that the mouth of the uterus is first spread, and then open, until it opens ten centimeters, this process is the old man said the opening of the bones, the fetal head diameter is generally within ten centimeters, so open ten fingers, the baby can be born successfully.