Dewan, who married Tatum in 2009, gave birth to the couple's first child in May, reported People magazine.
"As new mamas know, the baby is crying and you're like, 'What do I do to make her stop crying?'. All of a sudden he starts beatboxing and she starts cooing.
"I'm like, 'What?! I have been rocking her. I have been swaying her. I've been doing squats' and he gets here and she would just fall asleep in his arms," she said during Ellen DeGeneres talk show.
"It's like the one thing he knows he can do. He's like, 'Let me get in there. Let me change those diapers.' Here you go!," she said.
