Triplets Rosalie, Regan and Rocco Mullane, now age 3, were among the many in vitro fertilization children taking part in the Boston IVF Baby Bowl at Gillette Stadium in Foxborough, Massachusetts, on Oct. 21. That state had the highest share of births involving assisted reproductive technology in 2015, at 4.5%. (Carolyn Van Houten/The Washington Post via Getty Images)
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