Make way for ducklings; on Jan. 23, Sen. Tammy Duckworth announced her pregnancy, making her the first sitting senator to ever give birth. Though she plans to take the 12 weeks paid leave that she guarantees her staffers, the announcement has sparked discussion about guaranteed maternity leave for federal employees in general. Senator Duckworth is the 51st woman to be elected to Senate — why is she the first to give birth while?