Mom's with older babies: when did you stop using bath support/ seats?

When I was confident in her skills to sit up by herself

@hperry845 I have a non slip mat in her tub. I still keep my hands on her a bit, because she likes to kick around at the toys

@g_lynn my daughter is only about eight and a half months, but she tries so hard to crawl of her bath seat I'm afraid that she will slip and fall. I'm thinking of changing to one of those non-slip mats

About 10 months.