My daughter did the same and my brothers gf did also. There are so many reasons that it could be. There can be a lactose allergy that seemed to be the most common next to acid reflux that I have seen. Is the baby burping enough?
Also, my friends son had bad acid reflux and it made him vomit after every feeding as well. He was put on a prescription medication to ease his symptoms and he did much better immediately after starting them.
My sister had piloric stenosis (sp might be wrong) as a baby horribly until she was over a year, and my son had it horribly until he was about nine months old. It causes a horrible amount of projectile vomiting and regular vomiting. It may be that that your baby has. My son's pediatrician told me that they basically have to grow out of it, which he seems to have. He is still small for his age, but he is up to the 24 th percentile and seems to be making gains all the time :) hope you figure out what is making your little one be sick.
It might be what you're eating . have you changed or eaten anything new that could upset the babies tummy ? I know caffiine and too many greans can cause them to have an upset stomach . or maybe your baby is just over eating ? Do u burp after feedings ?
Also it just recently started a couple days ago. It hasn't always been like this.