Did my baby just spit up or throw up?

I also fed on demand, my son did not take the food when he wasn't hungry. Maybe your baby did over eat, my son has done that in the past. Throwing up is when it shoots out with force. If it continues to happen call your pediatrician. Your baby can also seem more hungry because theyre going through a growth spurt. It sounds normal to me. But like I mentioned if youre worried see your md.