Almost 2 week old (12 or 13 days old) baby hamster!!!!!!???

My hamster had babies on the 31st of March or April 1st I'm not sure. But the mom has gradually ate her babies and now just one is alive(for now) cause I cleaned out the cage and then I put the mom and dad back in for a few minutes and then I slowly held the baby up to the mom (on a spoon) and she acted fine and I slowly put it in the cage (still on the spoon) and she went over to it and I thought she was giving it a bath and when I came back from getting her fresh water she bit her baby!!!! She had it in her mouth and was winding it up like a spider winds it's food up and my baby hamster is bleeding from it's nose and on top of it's snout thing!!!! Does anybody know if it's old enough for me to take care of it yet or if it will live???!!!!???? PLEASE HELP ME!!!! And thank you so much in advance!!!! Anything will help me!!!! It's still moving but the gashes from the mom's teeth are kinda deep!! :'(