What range is it in inches?
When they measure dilation during labor, they are actually measuring the cervix, not the vagina. The cervix is the opening to the uterus. It opens up to 10 centimeters, or 4 inches.
Ever seen a baby's head? About that big lol
(feels kind of strange to be a guy answering a guy's vagina question in Women's Health, but it is the 90s I guess!)
6 - 8 inches
fully dialated 10 centimetres
when it openeds to 10cm, the baby is ready to be born.