Wrong contraceptive method
A couple of fundamental traits in a strong marriage include trust and constant mutual respect. People change over the years, and interpersonal relationships are always subject to new developments among other things. No one is perfect. And sometimes errors happen, even repeatedly, just like in the following example.
Well, there are certainly worse mistakes that can happen. This one seems to be preventable. Since it’s their fourth baby, it seems as if they should take more precautions next time if they don’t want to have to make arrangements for a fifth baby. Or a sixth.