How do you get kiddo to SIT in the bath?
I had this problem with my son a few months ago. A friend recommended that I just repeat "on your bottom" every time he stood while helping him sit down. I thought it would never work and literally said "on your bottom" 20-30 times in a 10 min bath. But after a couple weeks, it really worked! He rarely stands up anymore and will sit pretty quickly when I say it. He was too young at the time to understand "on your bum or else you're done", but just repeating it over and over again was magic. Oh, and it really has helped with him climbing on the furniture too. I realize that I'm powerless to stop the climbing, but if he gets too rowdy, then I just say "on your bottom" and he does it pretty quickly.