Definition
A condescending phrase used to tell someone not to worry, implying they are not intelligent enough to understand a situation.
"I can't make heads or tails of these complicated financial reports." "Don't worry your pretty little head about it, I'll take care of it."
"How are we going to solve this tricky problem?" "Oh dear, don't worry your pretty little head about it, I'll handle it."
"The project deadline is approaching, and we're falling behind." "Don't worry your pretty little head about it; I have everything under control."