Baby not eating

Since birth she’s eats all her bottles super fast, now she only wants 4oz of a six oz bottle it’s been like that for a about a week, I’m not sure why and I don’t want her to go hungry that is dropping about 10oz a day then what she was normally getting. I had to change her formula bc it made her pee smell like literal poop. It’s the one from Germany the HOLLE brand. I’m not sure if it’s just fill her up more or she doesn’t like she was eating just fine until recently