Have you thought about WHY it is you want to have children? Be sure, be very, very sure you that you & your wife really want to have children for the right reasons, not just because of social/family expectations.
Have you considered the choice to be "childfree", as my husband and I have chosen to be?? Makes life a whole lot simpler and cheaper, especially with him being a professional pilot.
It's your choice - just remember that there IS a choice