Does this help?
"Structurally, the penis consists of two main parts, the shaft and the head (which is called the glans). Urine and semen exit the body through a tiny opening at the tip of the glans. At birth, the shaft and the glans are covered by a single continuous layer of skin. If circumcision is performed, the part of this skin that covers the glans is cut off. Immediately after circumcision the glans appears swollen, tender, and vivid red, since the foreskin was firmly attached to the glans before it was forcibly separated and then cut off.
In uncircumcised boys, the foreskin at first remains firmly attached to the glans, but gradually over time the attachments are broken (mostly by the stretching resulting from repeated normal erections). In 90% of boys the foreskin is loose and mobile by age 2, but the process can sometimes take five or more years. When the foreskin has separated from the glans, the foreskin can easily be retracted, or pulled back, to leave the glans exposed. Throughout life, a cheesy white material called smegma, consisting primarily of dead skin cells and secretions from sebaceous glands, will accumulate under the foreskin.
In uncircumcised boys, forcibly ripping the foreskin from the glans in the name of hygiene can lead to pain, scarring and adhesions. Do not try to forcibly retract the foreskin or to clean under an adherent foreskin with swabs, antiseptics, or even water. On the other hand, even though doing nothing at all may be considered natural, similar reasoning would lead to not cutting the hair, trimming the nails, washing the hands, or cleaning the bottom after a poop. Gentle hygiene enhances health.
Only the outside of the foreskin needs to be cleaned during the first year. It should be cleaned and bathed with soap and water just like the rest of the diaper area. After his first birthday, you might want to very gently pull back on the skin of the shaft to see if the foreskin retracts. If it doesn't at all, don't worry and don't force it! There is certainly no rush. If urine can flow freely, the hole in the foreskin is big enough. As long as the foreskin doesn't easily retract (even in a ten year old), only the outside needs to be washed. If the foreskin retracts a little, it would be okay to gently clean the exposed part of the glans with water (but don't use soap while the foreskin is still partially attached to the glans, since this can irritate this tender area). After cleaning, always pull the foreskin forward to its usual position. This is very important otherwise it can get stuck and lead to serious damage.
Once the foreskin has completely separated and retracts freely, begin to teach your son to retract his own foreskin and clean underneath it when he bathes, or at least once a week. For most little boys this personal cleaning will not become a habit unless you encourage it. Mentioning it positively and frequently throughout the years can instill an important sense of responsibility, prevention, and health that will benefit him for years to come.
Your bathtimes together are precious now, but the habits you help your son develop might also reduce sexually transmitted diseases and cancer of the penis (and cervix in his partner) when your little boy becomes a man."
Source - DrGreene.com