One Doctor told me that male and female are as different as can be and still belong to the same species. But it is very true, and the couple discover that in time. They will be right about that. This is really spiritual growth, again, if only they consciously play it that way. Then if children arrive, this generosity spills over onto them.
Babies are very cute and enjoyable part of the time.
But at other times, they can be trying. To accept all this not just as a natural nuisance, but as part of the Father's plan - again, this is very sanctifying. In a monastery a monk may get up at 2 AM to make a holy hour. He knows that when the clock has moved 60 minutes he can go back to bed. But if baby fusses or is ill at some small hour, then the parent makes a different kind of holy hour - it is a holy hour, if taken as part of our Father's plan.