Get it done. Sorry to go against the grain and be blunt and all that, but DH has just needed a circumcision+ as he had this problem as a child, never did anything about it, ended up needing not only a circumcision but also some penis reconstruction type surgery in his 30s. I'm getting Liebling done when the schools break up, get it done early.

The GP gave us some signs to look for that would indicate that circumcision should be done as a preventative measure. These include not being able to retract the foreskin (Liebling was OK as a toddler, or almost OK and the nurse wasn't worried when I spoke to her, but it's getting worse now - but it wasn't something I checked between the age of about 18m to almost 6 years) and also some "bubbling" when weeing: basically, the wee is caught under the foreskin and it looks like it bubbles up before being able to escape.