After two back to back regurgitations don't feed for three weeks and then offer a feeder a size smaller than he was taking. So, if he was eating adult mice then offer a mouse hopper. Don't feed again for two weeks, then offer another half-sized meal if the first one stayed down. If that one stayed down then offer a regular-sized feeder two weeks later.
Since he's regurgitated I wouldn't ever feed him more than every 10 days once he's back onto normal-sized feeders. Boas have a slower metabolism than pythons, so putting them on a 5-7 day feeding schedule can cause problems.
While you're waiting the three weeks before feeding again, go to thebeanfarm.com and get some NutriBAC, it's a reptile probiotic powder. Dust his damp frozen/thaw feeder with a pinch of the powder for the next few months to help re-establish his gut flora. Also ensure that the enclosure temperatures are correct, the UTH isn't creating a hot spot higher than 92*F on the surface of the glass (my boas won't use the basking spot if it's higher than that), and get an undumpable water dish so your baby can't chill himself again. The melamine cat and dog bowls from the dollar stores that are wider at the bottom than the top work well.
Since this is a new addition from a retail store I hope he's quarantined well away from any other reptiles you have, as regurgitation is a symptom of some rather nasty and highly infectious diseases, including parasites and cryptosporidium. If he regurgitates again take him and the regurgitated feeder straight to an exotics specialist vet and have a fecal done and the regurgitated feeder checked.
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