Michael Phelps advances in first event at swim trials as newborn son watches

Michael Phelps advanced easily in his first event Tuesday at the U.S. Swimming trials, turning in the best time of the day in the 200-meter butterfly with a preliminary heat of 1 minute, 56.68 seconds.

Phelps did it with his 7-week-old son, Boomer, watching from the stands.

#teamdaddy all day err day!! We LOVE you @m_phelps00 and we're cheering super loud for you!! 💙

A photo posted by Nicole Michele Johnson (@nicole.m.johnson) on

"My third turn was bad, awful," Phelps said. "Killed all the momentum. I felt like I didn’t really use much legs, dragging them through the way. But it’s something to build off of. We’ll see."

The 22-time Olympic medalist came out of retirement to try to qualify for the Rio games. And while rival Ryan Lochte was among the familiar faces who struggled at the trials, Phelps was encouraged by the new talent making names for themselves.

"I don’t even know half of them," he said. "It’s exciting to have new faces, where people are really pumped to come up in the sport. That’s a good thing to see as I’m on my way out."

The Associated Press contributed to this report.