Childbirth anesthesia is generally lumbar anesthesia, anesthesia needles including anesthesia needle and extension handle, general anesthesia needle length of 6 cm, extension handle about 10 cm long. Most of the anesthesia for child birth is injected from the lumbar vertebral space, and the usually chosen site for injection of anesthesia is the lumbar 2~3 or lumbar 3~4 space, which reduces the intensity of pain of the mother through the injection of anesthesia, and blocks the transmission of pain sensory nerves during childbirth without affecting the uterine contractions, so as to achieve the purpose of avoiding or alleviating the pain of the mother during childbirth, under the principle of preserving the safety of the mother and the fetus. General anesthesia needle length of 6 cm, lengthening handle about 10 cm long. But there are more obese pregnant women may also be used to extend the handle, to ensure that the depth of the needle can reach the expected position, and thus ensure the effect of anesthesia. Pregnant women should cooperate with the anesthesia to set up a good position during painless delivery, and generally the risk is small, so pregnant women do not need to worry too much.