bpt – While I agree that there is a big difference between no kids and one or two kids -I disagree that they aren’t going through any Tzaar. E/o’s Tefillos should be answered for what they feel in their life is lacking.
As a side note -I once heard about s/o who said after she stopped having kids that she feels like an Akarah. This person has 14 kids. I don’t understand how s/o could make such a comment!