The 9-week-old helped his famous dad get ready for the Rio Olympics

Michael Phelps may have a future Olympic swimmer on his hands.

The new dad was joined in the pool by his 9-week-old son Boomer for the first time, as seen in new Instagram photos Wednesday. The father-son duo enjoyed a relaxing day in their backyard, and little Boomer’s smile proves he’s already a natural in the water.

“The little man loved the water today!! @boomerrphelps and I got some extra laps in today!! #mpswim,” the proud papa, 31, shared in his latest Instagram photo.



Want all the latest pregnancy and birth announcements, plus celebrity mom blogs? Click here to get those and more in the PEOPLE Babies newsletter.

In addition, Phelps’ fiancée Nicole Johnson also posted a pool shot, writing, “@boomerrphelps and I #relax while daddy @m_phelps00 works.”

And Boomer, who was born on May 5, even shared a family photo on his very own social media account.

“I loved going in the pool today with @nicole.m.johnson (mommy) and @m_phelps00 (daddy) today! Can’t wait til I get to learn to swim from daddy and @coach_bowman !” the caption read.

Though it was Boomer’s first time in the water, he’s already watched his famous dad dominate at work. In late June, Johnson and her son were in the audience when Phelps competed at the USA Swimming trials, where the most decorated Olympian of all time advanced to compete for the final qualifying round.

RELATED VIDEO: Does Michael Phelps Already Have a Future Olympic Swimmer on His Hands?!

Phelps has said after this year’s Rio Olympics, he will be retiring from swimming. On July 1, the 18-time Olympic gold medalist took on rival Ryan Lochte for the last time on American soil at the Olympic Swimming Trials in Omaha, Nebraska.

“For me to be able have the Olympics, a wedding and having my firstborn be able to watch or be able to be there while I swim in my last Olympics is something that is absolutely special,” Phelps told Today‘s Matt Lauer.

— Karen Mizoguchi