MY BABY RAT FELL OUT OF CAGE!!?

I looked in my room and one of my 1 1/2 week old baby rats was on the floor across the room from the cage.... I never have touched one before putting this one back in the cage. The cage is high up probably waist high and i thought it would kill it but it didnt!! It still hasnt gotten its eyes open so it was crawling around slowly. Is this dangerous?? How could this have happened. The babies are with their mother in a cage not an aquarium. and they are in the plastic bottom part below the bars so they would have to be liffted or the bedding would have had to be mounded.... someone help please??? and i put it back in and the mother didnt bite me is it going to be neglected