Merope
She does not need to live and see her son grow up to know that he will look exactly like his father.
Beautiful, beautiful Muggle Tom Riddle and his flawless face. She smiles down at the bundle in her weak arms that the Nurse still has to support, just in case Merope's arms fail completely. She is dying. She knows she is. And it saddens her greatly to know that her perfect son will never know his Mother.
But she believes she is leaving him with a good life at this Orphanage.
A better life than she ever had, anyway.