Third stage of labor: The part of labor from the birth of the baby until the placenta (afterbirth) and fetal membranes are delivered. The third stage of labor is also called the placental stage. SLIDESHOW 13 Early Signs & Symptoms of Pregnancy See Slideshow From Pregnancy and Parenting Resources What Not to Do If You Want to Get PregnantPregnancy Week by WeekMDD & Pregnancy: What You Need to Know Featured Centers Good and Bad Foods for PsoriasisVideo: Getting Personal on Life With MS Health Solutions From Our Sponsors Shot-Free MS Treatment Your Child and COVID-19