Only 2oz for month old?? HELP PLEASE!

My baby was drinking about 3.5 oz of formula and doing fine until recently she started spitting up waaay more than usual and its after every meal. I took her to the doctors and he said she only should be drinking 2oz and that was the reason for her gas and spitting up. She also has little red bumps on her face that are spreading all over her body but he said that was also normal? Ive been giving her the 2oz but she’s still spitting up, enough for it to splash on the floor when i was burping her. Im just really concerned and terrified of dehydration. Her pee has also developed a smell, which it didn’t have before, it used to be odorless

Im sorry its so long but im a first time mom and really concerned. I know i shouldn’t doubt the doctor but i was thinking it was something like she needs a formula change or reflux. Has anyone else gone through this??