Bath seats for older babies

My son is just about 10 months and since he grew out of his baby tub i either bathe him in the kitchen sink or I bring him in the shower with me. Tonight I figured I would try throwing him in the tub with my 9 year old and obviously this was an epic fail lol he’s so busy and just wants to stand and move around so it was just too dangerous to do again. What kinds of seats do you guys use to bathe your babies? I honestly don’t remember what I used for my daughter, it was so long ago! Thanks!