It doesn't MATTER whether they could "manage it" or not. Childfree women -- and men -- simply PREFER not to have children, and their personal reasons why are really none of YOUR business.But if they could manage it would they need to make the choice not to have them? They are obviously worried about having children.
I'm still wondering why you have such issues with any woman or man who chooses to be childfree, since that doesn't affect anyone else's decision to HAVE kids. Do childfree people have too much money or FREEDOM that you don't have?