Baby bathtub recommendation?

So my daughter is now 3 months, and the baby tub we got has worked well enough up until this point. It was just a random one we found on Amazon that had decent reviews. It had an attachable sling which was nice until now. She’s not big enough to sit in the infant part of the tub yet without sliding down constantly, but she’s now too heavy to use the sling because her back hits the divider part of the tub used for sitting. It’s just not a very well designed one. Anyone have one they love, and could recommend, that will work well as baby keeps growing?