Potty seats!!

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Okay so my daughter has been doing amazing with potty training. We’ve been using a little potty but I’d like to try introducing her to a potty seat on the big potty soon. What’s the best way to go, get a potty seat with a ladder? Or get a step stool and a potty seat? Or does she even really need a step stool (I would assume she does but I’m a FTM).