初生牛犊(儿)不怕虎

Pronounced: chūshēng niúdúr bú pà hǔ
Literally: “A just-born calf doesn’t fear tigers.”
Means: This describes someone who, because they don’t realize the full danger involved, does brave or dangerous things that others are afraid to do. It can be a good thing or a bad thing, depending on the situation.