My hydrocephalus was not discovered until after I was born in september of 1979. Simular to your son my head kept getting larger and it was caught and and diagnosed. It it is caught early enough then that is a very good sign. I am now 32 years old and for the most part have lived a fairly nornal life. I had revisions as a child on my shunt. I went roughly 23 years or so with no issues until last year when I had a breakage in my tubing and had to have another tube inerted. Everything is fine now and so as long as you watch for small things to change I think it will be ok.