I was only talking about a small proportion that have issues of not being able to pull back the foreskin. However the point was that it does happen and so some can develop issues, even if it is just aesthetic and discomfort not majorly health effecting.
The following may be anecdotal, but it does support the assertion that not taking care to pull back the foreskin during a young age can lead to the foreskin 'attaching' itself.
As a young kid (4 or 5?) I can still remember my parents having me lie down on bed and one of them pulling back on the foreskin and the foreskin pulling away from the glans painfully as it bled slightly. The foreskin seemed to want to attach and this was due to me not cleaning it properly by pulling back the foreskin. Obviously iI learned very quickly to do this and have not had any problems since then.
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