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By PEOPLE.COM/Lindsay Kimble
Aug 11, 2016 @ 9:00 am

At 3 months old, Boomer Robert Phelps is already dressing for success—his dad’s success.

The infant, swimmer Michael Phelps's son with fiancée Nicole Johnson, was decked out in full Team U.S.A.-inspired garb for Rio’s fifth day of competition.

In a snap posted to his own, personal Instagram, Boomer modeled a precious pair of red, white, and blue shorts with a white onesie, which featured a flag-waving smiley face cheering “Team Daddy!”—a look he first debuted at the Olympic trials.

Phelps’s now-21 gold medals even got a nod with Boomer’s Freshly Picked baby booties, which were a shiny shade of gold.

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“Way to go daddy!!!!” the adorable image was captioned. “#usa #rio2016 #pantsonfleek.

Johnson and Boomer were in the stands to watch Phelps, 31, earn the gold in Tuesday’s 4×200 men’s relay, and, earlier, in the men’s 200-meter butterfly.

Time to wake up!!! Daddy is racing soon!!!

A photo posted by boomer phelps (@boomerrphelps) on

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The swimmer still has several events left, including qualifiers for the men’s 100-meter butterfly on Thursday.