United States health officials say the number of twin births nationwide has dropped to their lowest level in 10 years. The U.S. Centers for Disease Control and Prevention, CDC, reported the decrease. Twin births nationwide began to increase about 40 years ago, CDC records show. From 1980 until 2014, the total number rose 79 percent. But from 2014 to 2018, the twin birth rates fell 4 percent. Last year, there were 32.6 twins for every 1,000 total births, the CDC reported. While the latest drop was not huge, officials said they consider it a good sign. Pregnancy with more than one child raises the risks of complications and death for both the mother and the baby.