New Dad Michael Phelps Shares Photo of Son Boomer on Instagram

Olympic swimmer Michael Phelps and his fiancee, Nicole Michele Johnson, have welcomed a son. 

Young Boomer Robert Phelps is a Cinco de Mayo baby, according to his dad's latest Instagram post, and he's a cutie. 

The elder Phelps captioned his photo: "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!!! @nicole.m.johnson and Boomer both healthy!!!"

A new baby and his final Olympic Games—2016 is shaping up as a big year for America's most decorated Olympian. 

[Michael Phelps]