Puking milk , not spit up, puking

discohiker

I have a champion nurser.... he is two weeks, two days old today and has never had issues nursing.  He has gone from a low of 8lb9oz in the hospital to 10lb8oz today, all EBF. 

However, four days ago, yesterday at noon, and now this morning, he threw up a tremendous amount of milk and partially digested milk.  

After getting cleaned up, he goes back to the breast and is fine.  He poops fine, he pees fine, and isn't lethargic or have any other odd symptoms.  

Why is my kid over-eating?  If I pull him off the breast, he gets fussy.  If I leave him on, I end up with BM puke everywhere.  Yes, I do burp him and I don't eat dairy.