Baby Eating Less

Cheyenne
I have a 6 week old and just a few days ago, she was downing four ounces of formula every 1-3 hours. Now, it's like I can barely get her to eat! She'll eat an ounce, maybe two if I'm lucky and spit most of it back out. I just want to know why my baby just stopped eating so much and if this is normal? 😞