I'd love to get some perspective on this issue as I'm really not sure the right way to approach it!
DS was 3 in December. The last couple of months he has become reluctant to do much for himself, even though he is perfectly capable. He will occasionally decide he wants to do something for himself (which is how I know he's capable!) and is very motivated when it is something fun or that he wants to do. The things I'm talking about are things like getting himself dressed, walking up and down the stairs without help and going to the toilet.
He has been potty trained since around October with virtually no accidents until recently. Now I have to remind him to go as he just won't take himself, will just wet himself and won't tell anyone. When it is pointed out, he just shrugs, it doesn't bother him at all to be wet, whereas it did when he was first trained. He doesn't have poo accidents, although has started pooing in his night time nappy again which I assume is for much the same reason that he can't be bothered when he knows I will sort it out for him.
Dressing is the same, He is fine to do it when he chooses to but if I ask him, he will roll around on the floor screaming that he can't do it 
I know that this is probably a very common phase, but I'm still not sure how to handle it! Should I be letting him tantrum (often resulting in an accident if it is going to the toilet related) until he does whatever it is for himself, or should I just give in and help him? I'm obviously just a bit worried that that approach will mean I am dressing him until he is 16, as why will he decide to do it himself if someone is always willing to do it for him?!
Does the dressing thing and toilet thing need to be dealt with seperately or are they part of the same thing?
I think I've just got myself in a tizz about it and can't see the wood for the trees, please can you tell me how you would handle it?!