Meanwhile evil me wanted to say: Actually we might not be able to have children and it's heartbreaking to think about, but thanks for reminding me! Maybe you should keep your fat mouth shut.
Sadly, with some people, even this doesn't work.
My best friend had a lot of medical problems when she was younger, and despite the fact that she now looks and feels healthy, she's been told that she can never have children. It would be highly unlikely that she could conceive, and even if, by some miracle, she could, her body isn't capable of carrying to term. However, she and her fiancÚ are pretty clear that they don't want children yet. (They're only 23).
This doesn't stop various people, from women at her church to her own aunt, telling her that "God will grant her a baby" or cooing about the blessings of surrogacy and adoption.
So yeah, some people just have to be bean dipped forever.