How much should a 3 week old be eating? She's breastfed btw if that matters. TIA

Like a boobfull lol. Nurse her as often as she wants. You can't over feed her.

Until she's done. There is a huge 3 week growth spurt. Feed on demand. My daughter would go from boob to boob straight for like 3 hours. I got nothing done during that time.