Non-religious circumcision in the west seems to be more or less an American thing. Certainly no-one I know at home has had it done. American doctors used to say it lessens the chances of infection, but this is largely pooh-poohed by British doctors, who suggest occasional washing instead.
I saw many, many uncut versions at home in school locker rooms – when I was a schoolboy, I hasten to add – and don’t recall ever seeing anyone with willy rot. On the other hand, one of my American friends who was mutilated as a child claims that the head of his pecker is like leather and that it lacks sensation.
IMO, if you want to mutilate your baby, that’s up to you, but don’t do it for so-called “hygiene reasons” – its entirely unneccessary.
And of course, since the foreskin is a veritable jungle of nerve endings, having it hacked off is bound to hurt like the very devil, whether you’re a baby or not.