I think I'd be treating him with kid gloves for a year! It sure wouldn't hurt to feed multiple tiny things until you're positive he's completely healed.
But with people, when they've have GI surgery, it's routine to test the next day for a leak, and if there isn't one, they start eating. Even a big surgery like gastric bypass or when part of the esophagus is removed and the stomach pulled up to reconnect- they are eating for sure within a week.
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