You may want to wait a few more days to try again. Some breeders have more luck feeding rougly a week after shedding.
Are you feeding inside their enclosure? You probably are, but in case you aren't, you should. Feed at night, and just let the mouse/rat wiggle in front of the hidebox hole, so the baby can see it and smell it, without any stress.
If trying dead:
Is it warm enough? Babies sometimes need much warmer prey to realize that it's food. Not cooked, and not burning-hot, but warmer than normal.
Try annoying the snakes with the rat by poking at the snake with it. Not too hard to too long, or course, but a little poke in the face can help.
Don't quit!! If you see tongue flicking, but no biting action, don't give up. Some snakes are timid and it can take them a while to be brave enough to eat.
If trying live:
Is your food item old enough? While you don't want a mouse or rat that is too old, a hairless / newborn rodent emits much less heat and moves around a lot less than a rodent that has grown a little hair. Try using slightly older prey - take care not to offer something too big, but you'd be surprised the size of rodent these babies can handle. You'll likely have more luck with hopper mice.
Don't try daily - but every 2 to 4 days, so the snakes don't get stressed.
If nothing works, and in a week and a half you still have some non-feeders, you may have to resort to traumatizing force-feeding.
I found this link:
http://www.amazonbasin.com/feeding.htm , which is pretty good and describes how to forcefeeding baby emmies. I know they are not the same, but the process shouldn't differ.
Zoe