10 day old vomited

My 10 day old was wanting to eat an ounce every hour so I upped it to 2 ounces and she vomited right after finishing the 2 ounce bottle. Was it because she ate too much at one time? Do I continue to feed her an ounce every hour? Also she hasn’t pooped in over 24 hours... how do I stimulate her to have a bowel movement? She’s on formula.