Abstract
(BMJ. 2018;363:k4372) As maternal age rises in the United States, the age of fathers is also increasing, with the percentage of births to fathers over age 40 doubling since the 1970s. While the effects of increased maternal age have been studied extensively, there is a lack of conclusive research regarding the effects of increased paternal age on pregnancy outcomes. There have been suggested links between the high number of male germ cell divisions in aging fathers and autism, genetic abnormalities and other adverse outcomes, although previous studies have not been adequately powered. This retrospective population-based cohort analysis aimed to examine associations between paternal age and maternal and neonatal health in the United States.
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