Spit up vs vomit

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How do you determine its either or? Baby is formula fed... He ate 45 mins ago and after eating burped then laid him down.. 15 mins later he's fussy I didn't see that he spit up on himself. He doesn't spit up at every feeding but this is what it looked like this time. I just want to rule out if this is spit up or vomit. Does any other moms out there that formula feeds and baby tend to spit up? and how much spit up is normal? Help... Here is a pic... As he burped this all came out with it.. As soon as we cleaned him up he cried for another bottle. He drank about 6 oz in less then one hour...