Bare with me, this might be long!
A while ago, DS1 (2) went down for a nap but started really screaming after a little while. I think he might have hit his knees on his bed guard trying to climb out. He wouldn't put any weight on his legs for about half an hour and got very distressed when I left him to go for a wee. I gave him calpol and that seemed to ease it. Ever since that day, he's been randomly bursting into tears saying his knees hurt. Every time he says it I flex them and squeeze them and there's no obvious wincing, although today he did start limping when he said they hurt. There's no pattern, eg not after a busy day, and they don't 'hurt' all the time as he's still running around. I don't want to ignore it in case they do actually hurt, but at the same time he might have realised he gets a cuddle and an 'oh dearrr'. What would you do?