Have you imagine that someday you will do a water birth? As this article said that a water birth is exactly what it sounds like, giving birth to your baby underwater. For some of the same reasons you might soak in a warm bath after a hard day, you might be interested in laboring in a warm bath. Warm water decreases your hormone levels, blood pressure, the amount of pain you feel, and adrenalin, the “fight or flight” hormone responsible for making your stress level skyrocket and your blood pressure rise, all while increasing endorphin production, which inhibits pain. Since your perception of pain is influenced by your anxiety level, the amount of pain you experience while bathing also ebbs. You can imagine why that might be appealing while giving birth.

http://www.ririen.com/water-birth/