I have been reading this thread with interest and can give a man's perspective.
I was circumcised at a young age (5). I am now in my 30's.
I was "done" for medical reasons, the foreskin was too tight and i clearly remember it & my mum fretting, & there being no alernative. It was one of my earlier memories. I was put under general anasthetic in hospital and had a consultant surgeon do the operation.
I remember it being painful and sore and a bit traumati - at such a young age its all a bit bewildering - i remember my parents being dreadfully loving and really being remembering the big cuddly soft toy dog that i was bought - wearing hospital gown and with bandages on its tail!
The surgeon did an extremely neat job, something which i have come to appreciate as i am older, as i realise not everyone has such an operation done well. I have no visible scarring but i know that some people do.
As a child the impact was more in my mind than physically and yes it did have an impact if i'm honest.
Looking back I was dreadfully shy around "bathroom" times, for years and years later. i hated anyone seeing my penis, was always extremely embarrassed about what had been done to me - enough to always use a cubicle instead of the stalls in the gents, (though i suppose some men do this whether circumcised or not) - right up to adulthood . I'm certain the shyness was due to the op.
At school i would go to great lengths to hide myself in the changing room and cringed at sports times. I avoided the showers and did feel in some way inferior. I never mentioned anything to anyone about my feelings. They didnt dominate my life by any means but they were there.
However, as i came into adulthood it all faded away, and as my love life got going, the embarrassment disappeared as i realised partners weren't bothered, it never stopped me getting laid, and i stopped feeling inadeqate.
i cant say i've ever had a problem with sensation or sexual pleasure - i love sex and get huge pleasure from it, like most people. I suppose some might say "but it would be even better if you had a foreskin" but i actually don't think so or care.
All in all, i would say if you want to have your child "done" for your child, you need to have a good reason. I wouldn't do it to my children except for medical reasons, though i do think about hygeine, STI's etc although i see these as a side benefit from being cut rather than a reason to do it in the first place.
If you are in a religious community or somewhere where everyone has it done as custom then you have your own reasons i suppose but i would personally question it.
It may give your child a bit of a complex about that part of their body depending on the age it's done and the circumstances - circumcision in my locality seemed rare and no one else family or friends had much experience of it and it's never nice being the odd one out as a kid. Of course, i couldnt' care less now, but i did then.
Something for the OP to think about - i certainly would never go into it as a "casual" thing to do.