I have a whole library of tricks when it comes to converting..Try this one for hatchlings.... Cut a 2 liter soda bottle a little bit less than in half. Fill with hot tap water and place in the microwave for approx. 2.5 mins or until very very hot to the touch (NOT SACLDING- You don't want a boiled rat). Place rat straight into the water-no baggy. Allow to thaw near the enclosure for about 10 minutes or so or until squishy( the steam rising will pre-scent. If you need to reheat the water a bit, do so. Remove the rat with tongs/hemos and present the rat a few inches from the snake , include a lil zombie jive if needed. Typically this works for my stubborn hatchlings, I convert them after the 1st or 2nd meal.