QS, my both sons were circumcised at the age of 5. According to the latest study if you consult any Physician s/he would recommend (as my uncle did)that circumcision should not be performed on infants under 6 months of age. This brings up the question: when is the best time to perform circumcision?
Rather than going by the Hadiths and following the practice by our forefathers we must see which suits best for our sons and decide based on the benefits though it is very challenging. My point is the boys should be circumsised at the best age so that the surgical result will be more precise as I had gone through this experience with my own kids.
You can read further
http://www.doctorsopposingcircumcision.org/info/freeman.html