Hey Merline,if the milk comes out with force and the kid seems to be uncomfortable,its Vomiting. Else,curdled milk in whatever quantity is fine.Try elevating hid head while he sleeps,it should help!

<span style="color:#3B5998;"><b> @619a92cd86bd960014c02de9 </b></span> might be able to throw more light on this :)

merline - curdled milk will be less in quantity as compared to vomit. and vomit will be more liquid-like.