I don't know about a girl who would be a teenager now, but I remember hearing about a girl, who would probably be in her mid-30s now, who couldn't have anything but human milk until she was in her late teens, at which point they found a few other things she could eat.  I believe I heard about her from Lois Arnold, of the North American Human Milk Banking Association (not sure I have the name right, but something like that), in about 1997.  I remember that there was a point in time where the girl couldn't even take frozen breast milk, only fresh, which had been a huge challenge as she was needing a huge amount at the time.  The girl's mother practically had a full-time job, driving around to pick up milk from all of the different donors each day.  
 		 	   		  
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