Throw the baby out with the bathwater
Meaning
Discard something valuable while eliminating the unwanted.
Usage
Used when warning against overreaction.
Origin & History
Origins and dates here are approximate summaries. Many idioms have disputed or unknown origins, and not every date has been checked against a historical dictionary, so treat specific dates and stories as a starting point rather than a citation.
From a German proverb recorded in 1512 by Thomas Murner, cautioning against losing the good with the bad.
Thomas Carlyle used it in English in 1849.