throw out the baby with the bath water

to lose the good parts when you get rid of the bad parts of something You can't close the airport because one airline has problems - that's just throwing out the baby with the bath water.

Discard something valuable along with something not wanted. For example, I know you don't approve of that one item in the bill but we shouldn't throw out the baby with the bath water by voting the bill down . This expression, with its vivid image of a baby being tossed out with a stream of dirty water, is probably translated from a German proverb, Das Kind mit dem Bade ausschütten ("Pour the baby out with the bath"). It was first recorded in English in 1853 by Thomas Carlyle, who translated many works from German.