A study of 752 pregnant women in Japan found that several psychosocial factors during pregnancy significantly impact marital satisfaction after childbirth. Higher depressive symptoms, measured by the Edinburgh Postnatal Depression Scale, were linked to a greater likelihood of decreased marital satisfaction. Additionally, lower household income predicted a decline in satisfaction. Participants who spent excessive time on household chores and childcare were less likely to report improved marital satisfaction. First-time mothers were also less likely to see improvements in their relationship satisfaction. Conversely, higher perceived family support correlated with less improvement in marital satisfaction. The findings highlight the need for early mental health screenings and support for expectant couples to help mitigate these challenges and promote better relationship outcomes.