Paediatrician said you shouldnt retract the foreskin. (We got a referral about 18 months ago because apparently his foreskin looked a bit tight (according to my mum who knows of these things - all three of my brothers had to be circumsized). But all was okay apparently.
well, no, you shouldn;t really as it can apparently cause problems, but I did with DS1 a little when he was complaining, more to ensure it was 'movable' IYGWIM, rather than pull it right back, for our own reassurance.
DS1 ended up pulling his right back not long after tho as he got chicken pox, and lots were right under his foreskin and he was in terrible pain......needed antibiotics for it in the end, but more because the spots got infected rather than him doing damage pulling it back 'too soon'.
DS2 has spent the last few weeks comparing himself to his brother.....his has not retracted as yet.....it will soon given how much he has started fiddling
Yes it may well be a tight foreskin. Take him to the GP/HV and get it checked out (he is at least young enough not to be mortally embarrassed by having to show anyone his willy): better safe than sorry ie if there is a problem with his foreskin then it can be dealt with.