(CNN) He's just three months old, has a patriotic wardrobe and has amassed more than 280,000 followers on Instagram.
While swimmer Michael Phelps has been collecting medals at the Rio Olympics, his son Boomer has been stealing hearts.
Photos show the infant dressed in red, white and blue outfits, smiling, yawning and napping. He can't talk yet, but in his photo captions, he's full of cheers for his famous dad.
"Today's a long day for daddy so I thought I'd catch a few extra zzz," says one.
I'm ready to see some more fast swimming!!Go get em daddy!!! Go get em USA!!! #usa #rio2016
Thousands and thousands have commented on Boomer's Instagram snaps: "So Adorable!" "So stylish and handsome!" they read.
It truly is just the best.... The feeling of the little guy relaxed and sound asleep on my chest! @boomerrphelps @nicole.m.johnson
Today's a long for daddy so I thought I'd catch a few extra 💤 !! #babyneedhissleep
Many posts show him dressed in patriotic outfits with stars and stripes, gold booties and a T-shirt reading, "Gold Medal Athlete."
Way to go daddy!!!! #usa #rio2016 #pantsonfleek
It was just a little over three months ago that Phelps and his fiancée, Nicole Johnson, welcomed the birth of their son. The proud father made the announcement on social media.
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!!! #boomerphelps 📷 @boonestudios
"Born 5-5-16 at 7:21 pm!!! Healthy and happy!" Phelps posted at that time. "Best feeling I have ever felt in my life!"
The most decorated Olympian ever has since posted pictures with his son, saying "It truly is just the best... The feeling of the little guy relaxed and sound asleep on my chest!
Phelps and Johnson, a former Miss California, announced their engagement on their Twitter and Instagram accounts in February 2015. They're expected to tie the knot after the Rio Olympics, but there's been no official announcement so far.
Phelps: All-time Olympic recordbreaker
U.S. swimmer Michael Phelps -- the most decorated Olympian of all time -- celebrates with his gold medal after the 4x200 freestyle on Tuesday, August 9. Phelps has won 21 gold medals so far in his career (25 medals in all), and he's looking to add more to his collection in Rio de Janeiro.
Phelps competes in the 100-meter butterfly during the Rio Games.
Phelps celebrates after winning the 200-meter butterfly in Rio. The victory avenged a loss at the 2008 Games in Beijing.
Phelps takes part in a qualifying race in Rio for the 200-meter individual medley.
Phelps shows off his gold medal from the 200-meter medley at the London Olympics. It was his 20th career medal.
Phelps celebrates in 2012 after becoming the most-decorated Olympic athlete in history. He had just won his 19th medal after the 4x200 freestyle.
Phelps competes in the 200-meter butterfly in London.
Phelps celebrates with teammates after winning the 4x100 freestyle in London.
Phelps looks on during the 4x100 freestyle in London.
Phelps climbs out of the pool in London after a shock fourth-place finish in the 400-meter medley.
Phelps is hugged by teammate Ryan Lochte in 2008 after winning the 200-meter medley in Beijing. Phelps won eight gold medals in Beijing -- the most-ever in one Olympics.
Phelps sets a world record in the 200-meter butterfly in Beijing.
Phelps shouts encouragement to teammates in the 4x200 freestyle in Beijing.
Phelps won six gold and two bronze medals in the 2004 Summer Games in Athens, Greece. Here, he holds a bronze from the 200-meter freestyle.
Phelps celebrates winning gold in the 400-meter medley in 2004. It was his first Olympic gold, and it came in a world-record time of 4:08.26.
Phelps smiles after winning the 200-meter butterfly during the U.S. Olympic Trials in 2004.