For years, doctors have been pushing to lower the rate of multiple births due to fertility treatment. Not only had two headline-grabbing births occurred in the same week, but several recent scientific papers also revealed mixed results in the eight-year effort to reduce the U.S. multiple-birth rate.

One paper, published last month in the reproductive journal Fertility and Sterility, found that although the rate of higher-order multiples (triplets or more) has declined, the rate of twin births has increased.

South Florida Sun-Sentinel