A. If he brought up hair in the vomitus he may have just been trying to expel the hairball. Sometimes they'll vomit without bringing up the hairball, then they'll get it up the second time. As long as he's not vomiting anymore, is playful and eating normally, he's probably find. You can purchase over-the-counter hairball paste which may aid him with expelling the hairballs in the future.
If the vomiting continues you should definitely take him to your vet for an exam in order to figure out what's causing it.
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