Baby Northern Pinesnakes are large enough at hatching to take half grown mice. Not to say that you should give them a large meal. Just that they can swallow something that large if they have to.
Use a large live furry or a just weaned (eyes open) mouse. While the snake is in its hide box and has not been disturbed, run the mouse into the hole and set something against the hole to block the mouse or snake from coming out. You should hear something going on almost immediately. Come back in an hour or two and you should have a snake with a lump in it.
Pinks offer so little nutrition that a baby pinesnake may, upon occasion, simply refuse it. He may expend more energy eating it than what he gets out of it in the end. A dead pink offers no visual or tactile stimulation. Pinesnakes are tunnel feeders. They feed by smell and touch. They often feel their prey and pin it as it tries to run past the snake. In a tunnel it is difficult to coil around the rodent. By introducing the live mouse into the hide box, it will often run next to or on top of the snake, eliciting a pinning response with the coils. The mouse will often be killed by pressure against the walls of the box (tunnel) rather than actually being wrapped.
Give it a try.
Cheers,
Terry Vandeventer