Tammy Duckworth and other well-known moms, make fertility after 50 look easy. But is it?

When Sen. Tammy Duckworth welcomed her second child, it was cause for celebration - not only because she had become the first sitting senator to give birth or because she has already begun to challenge the Senate to change its rules to allow her to bring her infant on the floor with her during voting. In giving birth to Maile Pearl Bowlsbey, Duckworth, a combat-injured veteran who has overcome considerable obstacles in her life, beat the odds yet again.

At 50, she became one of a growing number of women to have a child at an age once considered an unlikely, unwise or even irresponsible time to attempt new motherhood.

Times have changed.

The most