You’re not seeing double. A report from the Centers for Disease Control and Prevention said more twins were born in the U.S. last year than ever before. The actual numbers are still slim: 33.9 twins per 1,000 births, but that’s twice as many as in 1980. However, the numbers of triplets and other multiples have been declining. Experts attribute the twinning toll to increased use of fertility drugs — and older moms, who are more prone to bonus births, pointing to a growing trend of parents putting off multiplication until later in life.