A lumbar puncture in a newborn baby is not painful, or the pain is very minimal. If the child is highly suspected of having encephalitis, the doctor will recommend a lumbar puncture to determine if the child has a central nervous system infection by analyzing the nature of the lumbar puncture fluid. The procedure of lumbar puncture involves the use of a puncture needle to pass through the intervertebral space into the spinal canal, where the cerebrospinal fluid will naturally flow out. Only the moment when the needle enters the child’s skin will be painful, and the child will experience very little pain during the entire procedure. Therefore, parents should not worry too much, lumbar puncture will not cause great pain to the child, which is not necessary, so you can rest assured.