Women with infertility aren't forgotten by God nor are they enduring some awful punishment from sins past. In all honesty, these women have a special place in God's heart. It's through these women that miracles will be born and God's purpose will be fulfilled. It's through these individuals that others will come to know God's power. It's through them that future prophets, apostles, preachers, teachers, etc.. will be born.
God has an awesome habit of using the most unfortunate situations to demonstrate to the world just how omnipotent He is. And that, my friends, is what He's doing through the lives of infertile women all over the world. Because, let's face it, God is the ONLY ONE that can birth a child through a body that is seemingly "broken".
So, my dear sisters, if you find yourself being one of the infertile ones, do not be discouraged. God has not forgotten about you and He has not abandoned you. You are loved and cherished by the Father. Yes, your situation is disheartening and discouraging; there's no way to sugarcoat that. But take joy in the fact that God is working your circumstances out in such a way that you will have COMPLETE VICTORY when it's all said and done.