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Adverse Childhood Experiences (ACEs) are common and known to have consequences for individuals' adult health, leading to a higher risk of illness. The aims of the study were to investigate the ACEs in couples, to examine the extent of assortative mating and to investigate the association between the relationship of the load of ACEs within couples and health outcomes, one year after the birth of a common child. At antenatal clinics in Sweden 818 couples were recruited and investigated one year after the birth of a common child answering a questionnaire including the exposure to ten ACE categories and several outcome variables. In total, 59% of both mothers and partners reported exposure to at least one of the ten ACE categories. Among the mothers 11% and among the partners 9% reported exposure to ≥4 ACE categories (p = 0.12). There was a correlation between the numbers of ACE categories reported by the mothers and their partners (Spearman's ρ = 0.18, p<0.001). This association pertained to six of the ten ACE categories. In multiple logistic regression analyses, there were associations between the ACE exposure load and unfavourable outcomes among the mothers, the partners and within the couples. Unfavourable outcomes concerning health were most prominent in couples where both members reported exposures to ≥4 ACE categories (self-rated bad health (OR 13.82; CI 2.75-69.49), anxiety (OR 91.97; CI 13.38-632.07), depression (OR 17.42; CI 2.14-141.78) and perceived stress (OR 11.04; CI 2.79-43.73)). Mothers exposed to ACEs tend to have partners also exposed to ACEs. Exposure to ACEs was associated with bad health and unfavourable life conditions within the couples, especially among couples where both members reported exposure to multiple ACEs. These results should stimulate incentives to find, to support and to treat individuals and couples where both members report multiple ACEs. The consequences for the children should be further studied as well as how these families should be treated in health care and society.