Definition of Fourth stage of labor

Fourth stage of labor: The hour or two after delivery when the tone of the uterus is reestablished as the uterus contracts again, expelling any remaining contents. These contractions are hastened by breastfeeding, which stimulates production of the hormone oxytocin.

Last Editorial Review: 3/19/2012

Stages of Pregnancy Pictures Slideshow: See the 1st, 2nd and 3rd Trimesters of Mom & Baby

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