Yep, as soon as one's in his stomach, offer him the next.
I feed most of my new hatchlings on 'peach fuzzies'--rats that have just started to get their fur in. A 73 gram hatchling would get a fully furred fuzzy rat, eyes closed. It's about the same size as a small mouse. Sometimes I start them on mouse hoppers or smalls, depends on what I have in the rack.
I have had some hatchlings hatch out at 73 grams on occasion, lol. I usually feed fuzzies (eyes closed, furry), until they're over 100 to 120 grams, then they move up to crawlers/pups (eyes just starting to open).