What Symptoms Should I Watch For In My Infant With Hydrocephalus, And Can His Condition Become Severe Or Acute Without Surgery?

Hi. I have a 10 month old son who was diagnosed with hydrocephalus by doctors. The surgeon told me that he did not need surgery at the moment because his head was still loose. I want to know what symptoms may occur in my son? There is currently no problem with his appearance or behavior. I want to know if his illness can be severe and acute?