Don't worry your head about it

don't worry your (pretty little) head about it

Don't stress about a particular thing or situation. This phrase is usually conveys annoyance or condescension. Oh, don't worry your pretty little head about it—I'll just cook dinner like I always do.
See also: head, worry
Farlex Dictionary of Idioms.

Don't worry your (pretty little) head about it.

Rur. Do not worry about it. (Said condescendingly, and can cause offense.) Mary: How are you going to get another job if you don't start looking for one? Tom: Now don't worry your pretty little head about it. Just leave it to me. Tom: What are we going to do if we can't find an apartment? Sally: Don't worry your head about it. We 'll find one, one way or another.
See also: head, worry
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs.
See also:
  • don't go there
  • don't give up the ship
  • don't even go there
  • cast (one's) lot in with (someone or something)
  • cast lot in
  • all in (one's) head
  • Don’t sweat it!
  • discipline
  • discipline (one) for (something)
  • discipline for