Outgrown bath tub

Lauren • Baby boy Nate born 10-07-17

Any suggestions on what to do since babe is outgrowing his infant tub? We do a bath every other night, and he’s starting to get too big to fit comfortably. He can sit up, but not strong enough yet to be in the tub safely without wobbling. I’m not interested in bathing with him bc that would make bed time 10x longer