1st Hatchling feeding - Ratio of eaters

Ive been using hoppers/small adult mice for feeding mine, i only have one that has not taken its first meal so far.

I am all on the band wagon of feeding hopper mice for the first meal or two and when they got that figured out, then I switch them over to appropriate sized rats and its smooth sailing. Last year I tried rat after rat after rat on several hatchlings and have a few holdbacks that got stuck on soft furs and still wont touch anything else :(