this baby is darker in color and the nurse said, no, mrs. twigg, this is your baby.ything. and so regina was sort of pressured by the nurse to accept that, in fact, she was getting the right baby. >> i never dreamed, not for a second on this earth, that they had given me somebody else's baby. >> reporter: but that's exactly what happened. the twiggs only learned ten years later when arlena who was born with a heart defect needed surgery. >> in preparation for the surgery arlena's blood was typed. >> reporter: the blood test revealed arlena could not be the twiggs' biological child and a genetics test confirmed it. >> i went into total shock and my husband turned white. he almost passed out. i'm going back into this shock and just try struggling through all this horror of oh, my god. no, no, no. the whole gamut of thoughts went through my head. she has to be mine. she has to be mine. >> reporter: arlena died shortly after surgery and her grieving mother vowed to locate her missing child. >> what we want most to happen right now is to find our biological daughter. >> r