3 year old daytime wetting

[AllyJU]

My 3 yo DS has been out of nappies since the start of the Summer and all was going well until about a month ago when he started having accidents during the daytime. We regularly ask him if he needs to use the toilet/potty (it is usually obvious, as he will be 'dancing' with his legs crossed), and he always says no, only to have an accident moments later. If I leave him with no pants on at home (to save on washing), I'm finding patches of wee on the chairs he's been sitting on.
I'm not sure if it is just him being stubborn, or if there is a problem (I took him to the Doc before Christmas who gave him a course of antibiotics for a possible UTI, but this didn't seem to help). Has anyone else experienced this? Can anyone offer any advice?

I think this is fairly common and most likely behavioural as long as no other symptoms of illness eg pain from a uti or excessive drinking due to diabetes. Ds certainly went through a phase like this at a similar age. Absolutely adamant that he didn't need to go then would wet himself a few minutes later. Really frustrating!! Mainly seemed to be because he had better things to be doing! Two approaches worked for us - a reward chart, initially rewarded for being dry until say lunchtime, then built up the period. More recently we've rewarded him for going to the toilet without prompting (he's now 3.11 yrs). When it was at its worst I explained I would have to sit him on the toilet every couple of hours to avoid accidents, even if he didn't think he needed to go. He hated me doing this so soon started to go before any accidents!
But whatever approach you take be reassured it will get better!

Thanks for your message and suggestions - its great to know that its not just me!
I've tried him with a reward chart for other things (getting dressed etc), but he's not really interested stating: "I don't care about a sticker!" Its very frustrating, !

If he shows physical signs of needing a wee I wouldn't take no for an answer and would instead encourage/ coerce him to sit on the toilet. It's very normal and you just have to adapt to the phase he's currently going through. Ds is also 3 and yesterday was dancing around holding himself, told me he didn't need a wee but with some encouragement sat on the potty and filled it! Other times he'll ask. I mostly coerce him with gentle bribery: "come on ds, try to have a wee and then we can do x, y or z".

Ds wasnt particularly interested in stickers either! So we use a chart I found on the supernanny website where he earns points for good behaviour - we set a few targets for him. Once he has 10 points he has a small treat - varies from an outing of his choice eg swimming, a magazine or a (very) small toy, occasionally a food treat like chocolate. It is a more expensive way of doing it I suppose but it has really worked with him and we've improved a number of behaviours.