Three of a kind: From top, triplets Ruca, Max and Nadia Rhoton, were born Oct. 14 at Bayfront Medical Center, one of three sets of triplets born at the St. Petersburg hospital in the past 12 days. Their parents, Loren and Lesa Rhoton of Riverview, have four other children. Between 1980 and 2000, the number of twin births in the United States increased 74 percent, and births of triplets or more increased fivefold, says the National Center for Health Statistics.