Penis size is completely genetic.
No, penis size has nothing to do with circumcision.
It is all genetic - the size comes from the genes your parents pass on to you.
The penis size of a 12 1/2 year old boy should be somewhere between that of a toddler's and that of an adult, and probably in the range of the average between the two. That's a big range, and pretty much anything in between is not worth fretting about. Your penis will be as large as has been determined by your genetic makeup and level of nutrition, there is no salve, cream, pill or device that can make it any larger. So, you're normal!
Both ... that's the magic and wonder of science in our bodies.
Weights are not proven to increase penis size, and in fact it could be dangerous or harmful if you try hanging anything from your penis.
Yes, it is dangerous
There is no evidence that a persons shoe size has anything to do with how large their penis is
Penis size has little if anything to do with what size of boxer. Waist size is the only consideration. They have to stay up.
All you have heard are legends & urban myths.. nope your thumb, size of feet & hands nor the size of your nose wont tell you anything.. Drop trou & check it out is the only way to know & even that will be subject to the state of arousal.
There is no other physical trait connected to the size of the penis. Hand, feet, nose, general size or anything else.
Of course, homones start the process of penis growth, but the final size is determined by genetics . . . you inherit penis size from your parents.
There is no food, supplement, or exercise that has been proven to increase or decrease the size of the penis.