Personally I am glad that I still have my foreskin. I cannot imagine how uncomfortable it may sometimes get given how sensitive the nerve endings are where the foreskin would normally cover.

I am of the opinion that it is wrong to circumcise children just after birth unless there is a medical condition in which it is required or if your parents are religiously zealous. It is mutilation as it is getting rid of something which doesnt do any harm(unlike, lets say, the appendix). And there has not been proven to be any health benefits.

So the decision should be left up to the individual at adulthood. If you are not circumcised at birth, at least you may choose to become so. If you are, you cannot just decide to grow back a foreskin.