The 40-year-old actor and Fox are already parents to 11-month-old son Noah Shannon, reported Aceshowbiz.
"I do whatever she asks for and I say yes no matter what it may be. She's doing great. She did great the first time around, but I wouldn't wish the experience on anybody! I couldn't do it! I couldn't make a baby, it's unbelievable. I'm just hoping for a healthy baby," he added.
"I have to say, we honestly have no idea and we discuss it daily and think, 'How are we going to do this?'. I think we'll just see when it happens. People do it all the time.