Some info I found...
*care of the *uncircumcised male*
retraction or separation of the foreskin from the glans may take months to complete.
Do not retract (pull back) the foreskin from the glans of the penis. In a newborn, the foreskin is almost always attached to the glans. Forcing the foreskin back may harm the penis, causing pain, bleeding, possible scarring and adhesions
foreskin retraction occurs when the foreskin can be pulled back away from the glans. This process happens without anyoneâs help, and it happens different for every child. It may take a few days, weeks, months, or even years that foreskin retraction occur for the first time. In uncircumcised boys, the foreskin begins firmly attached to the glans, but over time, the attachments are broken.
this is done mostly by the stretching resulting from repeated normal erections. In most boys, the foreskin is loose and mobile by age 2, but this normal process can sometimes take five or more years.
*at some point during infancy, most babies discover that touching their genitals feels much better than touching their toes or tummy. Babies may find ways to rub their genitals (such as by rocking or bouncing) before falling asleep because they find the sensation soothing.
Whether during diaper changes or bedtime, there's no reason to stop your baby from touching himself, particularly if it's relaxing for him. This behavior is temporary, and it will eventually pass.
Babytalk, april 2005