Didn't have a chance to read replies so sorry if this has been said before.
I think it is important to learn to sit because of bowel movements. WHen DS1 was learning, he sometimes would say he had to pee, sit and then poop.. I think it would be hard to switch them from stand to sit quick for poop.
Just my thoughts.. get them used to sitting and peeing and pooping, then try the standing later. DS1 has been wearing underwear reliably for 7 months and we haven't started the standing yet. Might soon, but for now what him fully doing well before we add a new thing!
Linda - Mom who will never be afraid to use an Epi-Pen again! Epi-Pens save lives!
Charlie 4 yrs old, Harry 2 yrs old & someone new March 8, 2010!