Stages of Labor: After watching the video Labor and Delivery answer the questions.

• During stage 1 of labor what happens to the cervix?
• Labor can last 10 to 12 hours for first births, and 4 to 6 hours for subsequent births. What indicates that active labor has started?
• With each contraction, the mother pushes, forcing the baby down the birth canal. What of the baby emerges first?
• In stage 3 with the final pushes, what is delivered?
• What are teratogens and how do they impact development in the prenatal environment?

https://www.babycenter.com/pregnancy/your-body/live-birth-water-birth_3658855