DS is 13 now and I still get letters/phone calls every six months asking me to get in touch. Haven't been anywhere near them about him since he was 1. No thank you.
We see the paeds once a year, with the proviso that they're only an email away.
I feel once you have a diagnosis and anything acute is being dealt with, and your physio etc is into a routine, it's best to back off for a while from all these specialists and just concentrate on living/loving your child. I was plunged into the depths on countless occasions by this one and that one putting their twopenneth in and eventually just decided to get on with it myself and see what happened.