How do you stop your LO from climbing and trying to stand in the bathtub? I looked up past threads and seems like most people keep their LOs in the infant tub well beyond 1 y/o. K is only ~ 9 months but I am having the hardest time keeping her contained in the tub!

We have this tub (not using the sling) and no matter which side I seat her on, she leans back so her legs are hanging out, practically floating, kneeling, hanging over the side, or now her new trick is to pull up on the side of the tub. Frustrating! Does anyone use those tub seat things? Do they work?