I know he can do it because he used to dress himself until earlier this year when he just stopped. DP reckoned it was a phase about wanting to still be a baby so I just helped him when he asked for help and hoped he would grow out of it, but it's been going on for months now.
It's annoying as well as he doesn't even let me dress him properly, he has to contort into all sorts of positions and then expects me to be able to put his clothes on e.g. curled into a ball on all fours, sticking one leg up in the air for me to put pants on. It's really frustrating, but he often does it when we're in a rush especially, so I just try to get him dressed as quickly as possible rather than getting into an argument about it. Sometimes if we have more time I'll walk off and say "Let me know when you're ready to stand properly to let me help you, or you can get dressed by yourself" but this just leads to a long drawn out frustrating battle.
Occasionally have had success with the "race" approach but even this doesn't work most of the time, if we're running late and I need to find something he insists on trailing around the house to "help" me find it rather than getting his shoes on or whatever, even if I try to make it sound fun.
Any suggestions??