"'Ephraim's glory will fly away like a bird - no birth, no pregnancy, no conception. Even if they rear children, I will bereave them of every one. Woe to them when I turn away from them! I have seen Ephraim, like Tyre, planted in a pleasant place. But Ephraim will bring out their children to the slayer.'" NIV translation
God saw their promising future and yet they threw it away with their idolatry. While they look around themselves and see their prosperity, God warns them that it will all be gone even to the blessings of having children. He goes on to explain that they cannot blame the situation on their surroundings as they were "planted in a pleasant place". Their hearts led them into idolatry and their kids were going to pay for it.
This is a reminder to us, today, that our actions towards God have a big impact on the lives of our children. It is easy to look around and criticize the younger generation but we have to remember that they are a reflection of our spiritual health as a people. Much like the people of the prophet's day, we have become blinded by our prosperity.