I have a newborn that was never interested in nursing. Mom abandonded it and I tried w/ no luck to get it to eat. What could be wrong w/ it? I have had a few kids over the last few years that were failure to thrive. For no real reason just would not nurse and get w/ it. Mom had tried to get it to eat and she had no luck. Not really floppy or sickly just like a hunger strike. I can only think that there is something missing. I think the baby was a twin and it is doing well. I can't think of what the problem could be. What mineral or vit. could do this?