I wait a week until after their shed, then I offered a mouse hopper (or ASF hopper). New hatchlings are more likely to take a more active mouse/asf hopper than a barely moving rat pink.

Don't expect them all to eat on your first attempt to feed them.

I generally left the hopper in for about an hour - and if they hadn't eaten by then, I removed and just tried again a week later.

I've had no difficulties transitioning those started on ASF hoppers to rat pinks/fuzzies.

That's just how I did it, with great success.

Here's a great resource that Adam of 8ballpythons has on his site for getting hatchlings started:

http://www.8ballpythons.com/journal/...ingseating.htm