The incidence of triplet and higher-order multiple births rose fourfold during the 1980s and 1990s (1-3). This rise was associated with older maternal age and the increased spend of fertility-enhancing therapies (4,5) and was of concern because of the greater risk of adverse outcome of triplet and higher-order births compared with singletons and the added toll of these pregnancies on maternal health (6). Since 1998, however, and this trend has edged downward (3). This report explores the recent downturn in triplet and higher-order births by maternal demographic factors.
Source: cdc.gov