Everyone, meet Brandon Routh and Courtney Ford’s adorable 10-week-old son.

In a feature with PEOPLE, the couple showed off little Leo.

“He’s growing so fast,” the new dad proudly said. “My mom saved a pair of pajamas from when I was 3 months old and Leo already fits into them. In fact, he’s growing out of them. He’s busting out of most of his clothes, it’s hard to keep up!”

As for new parent memories? “The other day he gave me the surprise pee sneak-attack,” Ford recounted. “That cracked him up. It’s the cutest little laugh; it just kills me.”

This is the first baby for the couple who welcomed Leo on August 10.