Childbirth, also known as labour and delivery, is the ending of pregnancy where one or more babies leaves the uterus by passing through the vagina or by Caesarean section.In 2015, there were about 135 million births globally. About 15 million were born before 37 weeks of gestation, while between 3 and 12 percent were born after 42 weeks. In the developed world most deliveries occur in hospitals, while in the developing world most births take place at home with the support of a traditional birth attendant.
The most common way of childbirth is a vaginal delivery. It involves three stages of labour: the shortening and opening of the cervix, descent and birth of the baby, and the delivery of the placenta. The first stage typically lasts 12 to 19 hours, the second stage 20 minutes to two hours, and the third stage five to 30 minutes. The first stage begins with crampy abdominal or back pain that last around half a minute and occur every 10 to 30 minutes. The pain becomes stronger and closer together over time.During the second stage, pushing with contractions may occur. In the third stage, delayed clamping of the umbilical cord is generally recommended. A number of methods can help with pain, such as relaxation techniques, opioids, and spinal blocks.
Most babies are born head first; however about 4% are born feet or buttock first, known as breech. Typically the head enters the pelvis facing to one side, and then rotates to face down. During labour, a woman can generally eat and move around as she likes.However, pushing is not recommended during the first stage or during delivery of the head, and enemas are not recommended. While making a cut to the opening of the vagina, known as an episiotomy, is common, it is generally not needed. In 2012, about 23 million deliveries occurred by Caesarean section, an operation on the abdomen. C-sections may be recommended for twins, signs of distress in the baby, or breech position. This method of delivery can take longer to heal from.
Each year, complications from pregnancy and childbirth result in about 500,000 maternal deaths, seven million women have serious long-term problems, and 50 million women have negative health outcomes following delivery. Most of these occur in the developing world. Specific complications include obstructed labour, postpartum bleeding, eclampsia, and postpartum infection. Complications in the baby may include lack of oxygen at birth, birth trauma, prematurity, and infections.