The hazards of lumbar puncture in infants, that is, the possible side effects of lumbar puncture, are basically similar to those of adults, mainly the following: 1, there should be a struggle to avoid the reaction when in pain, unlike adults, whose lack of patience makes the process of lumbar puncture more difficult, increasing the risk of bleeding and aggravating the degree of pain; 2, infection is a local skin infection or central nervous system infection, if the operation process If the operation process cannot strictly comply with the aseptic procedure, it may happen; 3. low cranial pressure headache, after lumbar puncture, cerebrospinal fluid will be taken for laboratory testing, the amount of cerebrospinal fluid circulation in infants is already low, and after obtaining a certain amount of cerebrospinal fluid, it will lead to a decrease in the total amount of cerebrospinal fluid circulation, causing low cranial pressure headache and causing crying, which requires rehydration; 4. brain herniation, which is only seen in patients with serious organic disease of the central nervous system or posterior cranial recess with tumor or occupancy. When lumbar puncture is performed, the lower pressure is reduced and the upper higher brain pressure can cause the brain tissue to sink, which may induce herniation of the foramen magnum and lead to life-threatening conditions.