Intranasal oxytocin boosts positive maternal emotions and regard for child in postpartum depression.

Postpartum depression (PPD) affects many new mothers, often leading to impaired maternal caregiving and potential long-term negative impacts on child development. Current treatments, while effective for mood, may not fully address the nuanced deficits in mother-infant bonding. Oxytocin, a neuropeptide known for its role in social bonding and maternal behavior, has been explored as a potential therapeutic agent. However, its specific effects on caregiving behaviors, mood, and stress physiology in PPD mothers have remained inconsistently understood, highlighting a critical gap in optimizing interventions for this vulnerable population.

This double-blind, randomized, within-subject study investigated the effects of intranasal oxytocin in 45 mothers with 3-to-9-month-old infants, all experiencing clinically relevant depressive symptoms, with 35 meeting criteria for major depressive disorder. Participants received a single dose of 24 IU intranasal oxytocin or placebo. Researchers assessed maternal sensitivity, expressed positive regard for the child, self-reported mood, and physiological stress responses (using salivary cortisol and heart rate variability) during structured mother-infant interactions to determine the intervention's impact on caregiving and emotional well-being.

Oxytocin administration significantly improved specific aspects of maternal emotional experience and interaction. The study found that intranasal oxytocin increased maternal positive regard for the child, indicating a direct beneficial effect on observable caregiving quality. Furthermore, mothers reported enhanced positive affect following oxytocin, suggesting an improvement in subjective emotional well-being. However, the intervention did not influence maternal sensitivity, negative mood, or physiological stress responses, such as salivary cortisol levels or heart rate variability. This suggests a targeted effect on positive emotional processing rather than a broad antidepressant or anxiolytic action. The findings highlight oxytocin's potential to specifically strengthen the positive emotional aspects of the mother-infant bond in the context of PPD. > Oxytocin specifically increased maternal positive regard for the child and self-reported positive affect, but had no effect on sensitivity, negative mood, or stress physiology.