Yes that is normal.
The foreskin detaches from the glans (head of the penis) before the ring at the end loosens (I can never remember the name of the ring anymore *lol*).
This is natures design to protect the skin during the detaching phase. As the foreskin loosens the area is more prone to irritation and may slightly tear. By keeping the end of the foreskin closed it prevents the area from coming into contact with most irritants. And it keeps the area clean by flushing it with urine (which should be sterile).
The separation of the prepuce from the glans penis may occur at any age.7 Separation often starts around age 3-4 but it may not be complete until much later.1 Ballooning of the prepuce while urinating cannot occur until separation is underway. The occurence of ballooning indicates that separation has started.15 Babu et al. have proven that ballooning does not interfere with urination.21 Ballooning is a normal developmental stage and is not a cause for concern and does not require treatment.16 20 A child temporarily may report some discomfort or pain while urinating during this period. This occurs because the ballooning may tear at any residual connection to the glans. The discomfort will stop when separation is complete. The foreskin may still not be retractable at this point because the opening is still narrow. With increased growth and maturity, the ballooning will end when opening of the foreskin widens
The ballooning that you describe is notnecessarily a problem. Many American doctors are quick to recommend circumcisionbecause they are not familiar with the normal (intact) penis and foreskin.
The foreskin separates gradually over time. Unlessthe urine comes out as a fine mist, there is no need to do anything. Justleave it alone! This is very important, because by stretching the foreskinyou stand a very good chance of introducing bacteria into the area. Thisis how the vast majority of infections get started.
The American Academy of Pediatrics has publisheda pamphlet about this entitledNewborns: Care ofthe Uncircumcised Penis. It is available from the AAP or at thepreceding link.
Sometimes the foreskin will puff out, like a balloon, while a boy urinates. This is normal and is a sign that the foreskin and the glans have begun to separate from each other. [Bravo again! The normality of ballooning is seldom admitted. Ballooning is commoner in small boys than young men.] Foreskin retraction should never be forced. While the foreskin is still attached to the glans of the penis, do not try to pull it back, especially in an infant. Forcing the foreskin to retract before it is ready may harm the penis and cause pain, bleeding, and tears in the skin.
Why does my son's foreskin "balloon" when he urinates?
This is another indication that the natural separation of his foreskin and glans is occurring. One elderly Irishman tells how, as a boy he and his friends "lucky enough to have foreskins that ballooned" would stand in a row, urinate, then squeeze the balloon to see who could "shoot" the farthest. As the preputial opening widens, most boys decrease their chances of winning the game but increase their ability to retract their foreskins.