Many boys can develop a layer of “puppy fat” in front of their pubic bone. This “puppy fat” pushes the shaft skin forward so that it overhangs or covers the head of the penis.
The penis is anchored to the pubic bone and can get “covered” by the fat layer.
If that should happen with your boy, there will be a necessity, every day, when you bathe him, to push that shaft skin back firmly towards his pubic bone. This is for two reasons:
Don’t be scared of it. You won’t have to do it forever. Most boys tend to lose that “puppy fat” with running around, riding bikes and simple exercise!