what is the difference between the two?
Lately A has been "spitting up" every morning about 1.5 hours after her morning nursing session. Personally, I'm not that worried about it but DH saw it this morning and was all, "A just threw up!". Clearly, we view this topic differently.

Re: dumb spit-up/vomit question
this. you will KNOW when your baby is throwing up. it's more exorcist looking than just milk coming out of his/her mouth.
Dit.to.
Yep. Plus, the vomiting was accompanied by coughing and crying.