| http://www.w3.org/ns/prov#value | - The opening to the cervix is narrow except during labor and birth, when it stretches and widens to allow the baby's passage out of the uterus.Current as of: March 12, 2014Author: Healthwise Staff Medical Review: Kathleen Romito, MD - Family Medicine & Kirtly Jones, MD - Obstetrics and Gynecology This information does not replace the advice of a doctor.
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