You may have bacteria vaginosis or BV. That can cause the odor. I agree you need to see a doctor. As an FYI...BV is not an STD. I don't want to scare you.
Annie, I was typing at the same time, great minds think alike...lol.
Can you pump and store breastmilk instead? I think they have a gentilease formula, that is for sensitive stomachs. Do not feed cereal, she is too young and it will cause more problems with her stomach. She will most likely get constipated and her digestive system is still to immature to break down solids.