Yay!! Enjoy the squeakers

Since the others were all in the same cage it sounds like you may have more litters coming. If in the future you need to see if babies are getting fed, you may want to take the chance now to check over these guys as a reference. Drop a nice treat on one end of the cage, and then look at the bubs' bellies once Mom leaves. There will be a white band visible beneath their transparent pink belly skin. That white color is milk. Fed babies will get nice and round and full on that. Take care not to take too long - you don't want to spook Mom especially if she isn't used to being handled.