Anderson Cooper, Benjamin Maisani, Wyatt

Anderson Cooper, Benjamin Maisani, Wyatt

| Credit: Brad Barket/Getty . Inset: Anderson Cooper/Instagram

Anderson Cooper is still feeling some "fury" when it comes to missing one of his 13-month-old son Wyatt Morgan's major milestones.

The CNN anchor, 54, revealed during Wednesday's appearance on The Stephen Colbert Show that while he was on an overseas work trip, Wyatt - whom he co-parents with ex Benjamin Maisani - took his "first walk."

"So, just for the first time, I was away in Israel last week," he recalled. "It was my first work trip for 60 Minutes and I was doing an interview and I get this text from Wyatt's other dad, Benjamin, and he said, 'He just walked!!'"

While some parents would have been thrilled, Cooper joked, "My reaction was fury."

anderson cooper and son

Anderson Cooper and son Wyatt

| Credit: anderson cooper/ instagram

"I got really pissed at Benjamin," he continued, explaining that he couldn't believe he had missed Wyatt's special moment. "In my household when I grew up, you would lie about everything, so he should have just lied. He should have lied and said, 'Oh no, he's not walking at all,' so when I got home and he walked, we'd be like, 'Oh my god! It's the first walk.'"