"I mean, the things I have to pry out of his little, slimy hand," she said. "He's so stong, already."
"God forbid they wake up in the middle of the night," she added. "You know, if you wake my kid up in the middle of the night by accident, you're dead to me. If you come in my house, and you do some crazy thing and you make too much noise, you turn on the music -- you are out."
When asked who the late night disrupters were, Biel jokingly threw her husband's pals under the bus.
"Not my friends. My friends are quiet, demure, modest," she shared. "He's a wild musician."
Of course, the 35-year-old actress had nice things to say about her son as well.
"I mean, listen: It's not all terrible, by the way," she told Colbert with a smile. "He's, like, the greatest of all time. Now, I'm feeling really bad. He's cute. He's funny."