Join Date: Nov 2007
Location: Harrisburg, PA
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Think of your cervix as a cylinder with an opening at top and bottom (top = beside baby, bottom = end of vagina). During pregnancy, it's usually around 3-5 cm long, so effacement is determined by how much thinner it is. i.e. 1.5 cm would be around 50%. But it's very approximate/subjective. As for dilation, go with the inner os. The outer os can be quite stretchy, especially if it's not your first baby, and it's the os closer to the baby that needs to open to let him/her through. But of course, once you are mostly/fully effaced, the two openings sort of become one.
Clear as mud?
Lovin my sweet babygirl 3-17-10 and expecting another in March!
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