Ptt 大爆卦 | 5 3 in cm - 前往 https://americanpregnancy.org/healthy-pregnancy/labor-and-birth/first-stage-of-labor/

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First Stage of Labor | American Pregnancy Association

The first stage of labor is the longest and involves three phases which are ... 4 centimeters; Contractions will last about 30-45 seconds, giving you 5-30 ...

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