Squatting is the natural position for pooing, definitely my favourite and if you're normally a sitter I recommend trying it. Rather than using a step / stool of that kind in front of a grown-up toilet, if I'm not wearing a nappy I squat on my little potty. If I need to do one when I'm in a nappy, depending on how much room there is and how much pushing is needed I might squat right down, or part way, or just stand with legs apart and hands on hips. About the only position I don't often do poos in is sitting. I used to have a proper French-style squat toilet that was great both for doing poos in and cleaning up with a shower hose after a messy nappy. Haven't got round to fitting one at the new house though.