I would like to get my 6 year old circumcised,which dr can he go to?paedatrician or gp

Depends: While some pediatricians and primary doctors do circumcise, Many others do not. And those that do, usually do so only on infants. By 6 years old, however, it is likely urology would do this procedure. Best bet is to call the pediatric office and get a referral

Urologist: At least in the USA, neither pediatricians or GP's circumcise beyond early infancy, usually a couple weeks. At 6 yo the procedure will require a general anesthesia, stitches & post op recovery. While the practice in your country may differ, I doubt it differs much.