Why do men not attach to their children as well as women...?

I don't know. All I know is that my son prefers to play and joke with me, but prefers the cuddle with his mom. He will wiggle his way out if I try to calm him down by cuddling him, but with his mom it's easier for her. I can calm him down by making him laugh and his mom can't. Could the baby also be a variable in this equation?