There are no sequelae to cerebrospinal fluid aspiration in infants, and medical personnel typically extract cerebrospinal fluid through lumbar puncture. A standard lumbar puncture has few complications and no sequelae. The laboratory examination of cerebrospinal fluid can be very helpful in the diagnosis of central nervous system disorders, such as encephalitis. Common complications of lumbar puncture include pain and bleeding at the puncture site, headache after lumbar puncture, and cauda equina injury. Bleeding at the puncture site can be stopped by local pressure for a few minutes; pain at the puncture site and post-puncture headache can be improved in a week; cauda equina injury can be improved in a month.