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During labour and delivery certain hormones are acting on the woman's uterus, cervix, etc to make the tissue more supple and stretchy.
(P.S. It's the cervix that dilates to 10cm, not the vaginal opening although that does stretch to accomodate the baby's head.)
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Our doubts are traitors,
And make us lose the good we oft might win
By fearing to attempt.
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