Thanks for your query.
By your question do I understand that he has been operated upon once and is awaiting another surgery. In this case what was the first operation done and what was the result?
What does the neurologist
tell you about the condition of your son? Why was his/her opinion sought? Exaggerated reflexes in your son's case may be normal but can also be due to causes like hypocalcaemia
or other conditions. These can only be excluded after getting the complete report from the neurologist.
Just to mention here, some babies do face a problem due to prolonged stay in NICU where it is always lighted and beeps of machine and noise from medical staff does not give complete peace. If the NICU permits then do spend a lot of time with your son.
Wishing your son a speedy recovery.