Water birth delivery involves giving birth underwater in a tub or pool of warm water. It can help reduce pain during labor contractions by relaxing the mother's body. The baby is delivered underwater and then brought to the surface. Benefits include less need for pain medication, shorter labor, and lower risk of tearing for the mother. Risks to the mother include infection or water inhalation, while risks to the baby include infection or aspiration. Water birth is generally only recommended for low-risk pregnancies without certain complications.