When you have a child or three, remember the most important part about parenting. At some point, they will leave.
Never let them divide you, if you do, you’re dead meat. When they do leave, don’t get caught looking at your spouse and realize you are looking at a total stranger. Your partner should be your best friend. Your kids learn from observing. If they observe a healthy relationship, they’ll have their own. The worst thing you can do is put all your time into your kids and not into your marriage.