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We never have but I have a boy and he learned how to pee standing up pretty quickly. Not sure what we will do when it's DD's turn to be potty trained. That said, I usually carry antibacterial wipes so I can wipe down the toilet if he needs to sit (since he puts his hands on the seat).

We've taken our potty seat with us for trips. It came with us down South in my husband's backpack. We left it at my parents' house recently and got another one. For weekend excursions out shopping, park, etc, we have a folding one. LO is day trained to sit on the potty. We haven't attempted standing up yet.