not know you are born

not know (one) is born

To be unaware of or blind to one's own good fortune or ease of life. Kids these days don't know they're born, being able to do everything with a tap of their phones. Families in this country complain about their life, and then they sit down to watch TV in a warm house after a decent meal. I tell you, some people don't know they're born.
See also: born, know, not
Farlex Dictionary of Idioms.

not know you are born

If you say that someone doesn't know they are born, you mean that they do not realize how lucky they are. Unbelievably, he was texting all through their date. Some blokes don't know they're born.
See also: born, know, not
Collins COBUILD Idioms Dictionary, 3rd ed.

not know you are born

be unaware how easy your life is. informal
See also: born, know, not
Farlex Partner Idioms Dictionary
See also:
  • not know (one) is born
  • not know you're born
  • not know if (one) is afoot or on horseback
  • be, live, etc. in a world of your own
  • get into a world of (one's) own
  • in (one's) own (little) world
  • in a world of (one's) own
  • in a world of own
  • in one's own world
  • live in a world of (one's) own