6 month old has extra cerebralspinal fluid. im told will resolve on its own. is this true? what if left untreated?he has fluctuating anterior fontanel

Extra ???: The spinal fluid is produced continuously through life at about a tablespoonful per hour by structures in the brain. It circulates through it's normal pathway & is absorbed into the circulation from the brain surface. Blockage of flow must be opened or structures distort but the body adjusts to fluctuations in fluid amount.True excess production will produce rapid head growth & need surgery.