Your favorite baby bath cushion/tub for small newborn (about 5lbs)

Cord stump had fallen off so I’m looking for something safe to bathe him in with a comfy seat/sling that I can use for more than a few months. I don’t plan to bathe in kitchen sink...I’d rather do it in bathroom but the sink is pretty small. I have seen all the tubs with newborn slings but those tubs just look soooo big and like they’d take up a lot of room and be such an eyesore in the bathroom tbh when not being used 😅but I’m willing to reconsider if you can tell me why you love it! I do need something so I may just HAVE to go with a tub.

Also how do you guys keep baby warm while bathing? I just shudder at the thought of him getting cold 😫