Baby VOMITING

My baby is 1 month 1 week now, i have started with formula milk from week 2. I started with the basic formula milk, she was ok just had spit ups and her poop was yellow. Later now i changed to gold formula milk, only then once she started vomiting and her poop changed to greenish tan and smelly. My baby is vomiting 1 time everyday about 1 oz or 2 oz of milk that she have fed now. Is this normal, or shall i change the formula milk back to the basic?