The U.S. fertility rate has plummeted to the lowest point on record, according to new federal data. The first quarter of 2016 brought 59.8 babies for every 1,000 women, ages 15 to 44. That’s nearly half the rate at the peak of the baby boom in the late 1950s. The numbers show an unmistakable trend: Women in the U.S. who choose to reproduce keep delaying motherhood. Each generation has waited a little longer for motherhood than the last. Four decades…