How can I tell if it's vomit or just a lot of spit-up?

There are a few ways to differentiate the two: 1) If baby is spitting up after he eats or with a burp, it is probably just ordinary spit up. If baby is spitting up alot and it doesn't seem to be linked to eating, baby may be ill. 2) If the milk or food comes out without much effort, baby is probably spitting up but if baby seems to be straining or if the milk is being forcefully expelled, baby is vomiting. 3) Look out for signs of illnesses that might accompany vomiting such as fever, rashes etc http://www.livestrong.com/article/488261-how-can-i-tell-if-baby-spits-up-or-vomits/

thanks