I just finished nursing my 3mo old DS, and as soon as he unlatched, he spit-up a decent amount of bright yellow spit-up. (Think mustardy colored poop) He is 100% breastfed, and does spit-up a lot, but never that color! He has since spit-up again, and this time it was normal- just milk-colored. He isn't sick and is acting completely normal- right now he's bouncing around and cooing in his bouncy seat- and it didn't seem to upset him when it came up. Has this happened to anyone? Should I call the doctor? It kind of freaked me out!