A new study from Japan shows that strong mother-infant bonding can help protect children from the long-term emotional and behavioral effects of postpartum depression.
The research highlights the importance of early attachment in shaping a child’s mental health well into middle childhood.
Researchers from Shinshu University School of Medicine examined the combined effects of postpartum depression and bonding quality on sixth-grade children’s behavior.
Led by Associate Professor Daimei Sasayama and Professor Hideo Honda, the team found that secure bonding in infancy partially buffered the negative outcomes associated with maternal depression.
The study, published on April 15, 2025, in Archives of Women’s Mental Health, followed 245 mother–child pairs in Okaya, Japan. Mothers completed the Edinburgh Postnatal Depression Scale (EPDS) and the Japanese version of the Mother-to-Infant Bonding Scale (MIBS-J) within the first month after birth.
When their children reached sixth grade, both children and caregivers completed the Strengths and Difficulties Questionnaire (SDQ) to assess emotional and behavioral health.
Findings showed that 17.1% of mothers experienced postpartum depression, consistent with national rates. Children of these mothers displayed more psychosocial difficulties.
However, a key insight emerged: early mother-infant bonding significantly mediated these negative effects, accounting for 34.6% of the relationship between maternal depression and child difficulties.
“This suggests that improving bonding in the postpartum period can meaningfully reduce risks for children later in life,” said Dr. Sasayama.
The study also found that boys were more likely than girls to show behavioral issues such as conduct problems and inattention. These results were consistent across both self-reports and caregiver evaluations.
Experts say the findings underline the value of early mental health support for new mothers. Strengthening the mother-infant bond may serve as a practical and effective strategy to protect children’s future mental well-being, especially in families affected by maternal depression.
The researchers recommend future studies with larger populations, genetic and socioeconomic data, and deeper exploration of specific depressive symptoms that disrupt bonding. These insights could lead to more targeted interventions for mothers and their children.
This study offers a hopeful message: even when postpartum depression is present, early nurturing relationships between mothers and infants can make a lasting difference.
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