"Welcome Boomer Robert Phelps into the world!!! Born 5-5-2016 at 7:21 pm !!! Healthy and happy!!! Best feeling I have ever felt in my life!!!," he wrote.
Phelps, 30, is training for the United States Olympic trials that will be held from June 26-July 3.
He retired after the 2012 London Olympics, but announced a comeback less than two years later.
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(Reporting by Andrew Both; Editing by Steve Keating.)
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