"Throwing the baby out with the bath water' either your drain is huge or your baby is tiny either way just run your hand through the tub and make sure you didn't forget something.
@SUPERVlXEN people used to fill tubs from a river or stream heat it and the entire family would bathe from oldest to youngest so sometimes by the time the baby was washed the water would be so murky it was over looked until you dumped the water out.