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== == Your cervix prepares for birth by softening and thinning, or effacing. You won't feel this sign of labor happening. Instead, your health care provider will check for signs of cervical change with vaginal exams. Effacement is often expressed in percentages. When you're 50 percent effaced, your cervix is half its original thickness. Your cervix must be 100 percent effaced, or completely thinned out, before a vaginal delivery

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17y ago

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