When it comes to regurgitation it can be a very serious issue especially with a young animal and if this happens again after his next feeding you will need to take him to a vet, for now no feeding for 2 weeks.

Regurgitation can be cause by various things, stress, low temps, inappropriately or bad F/T feeder (if fed F/T) and internal parasites, in this case it could be due to stress if the animal was fed prior to bringing him home however it's not a guaranty so should it happen again I would highly recommend you to have a fecal done.