Most rapid repeat pregnancies, defined as those occurring within 18 months of a previous birth, are unintended. These pregnancies are associated with later initiation of prenatal care and are more common among people with lower socio-economic status and among racially and ethnically minoritised populations.

中文翻译：

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极快速重复妊娠的患病率和相关性：妊娠风险评估监测系统，美国，2009-2020 年

大多数快速重复怀孕（定义为上次分娩后 18 个月内发生的怀孕）都是意外怀孕。这些怀孕与较晚开始产前护理有关，并且在社会经济地位较低的人群以及种族和民族少数人群中更为常见。