The reason the members are asking about the setup is hatchlings requirements can be a little different than the larger ball pythons you already have. The main one being the size of the enclosure the hatchling is being kept in. You want to come as close as you can to what the breeder had it in. Most breeders will keep a hatchling in a tub about 6 quarts in size. bigger isn't always better. remember breeders don't have room to house maybe hundreds of hatchlings in something that takes up room. plus hatchlings seems to do better in a small tub compare to a larger one anyways.
start out with live large fuzzy or small hopper mice. if the hatchling doesn't feed, wait 2 to 3 days before trying again, any sooner can cause stress, don't handle the hatchling until it shows a good feeding response.
I keep all my hatchlings in 6 quart tubs and even the hatchlings that I have to assist feed to get started do very well feeding. I keep them in these tubs until around 300 grams. when I switch them to a larger tub some will go off feed, but they have the weight to support it for a little while.
if you have a tank setup already, buy a 6 quart tub from wal-mart around 1 dollar. place air holes in it. put paper towel in bottom small water bowl and lid on it. and set about 1/3 of tub on heat pad in the tank you already have. Keep the hot spot around 90. good luck, don