RESUMEN
BACKGROUND: Borderline personality disorder (BPD) is increasingly diagnosed in perinatal and infant settings, and research suggests that as well as an escalation of BPD symptoms in this period, these symptoms may also be detrimental to infant development. Providing tailored treatments during the postnatal period may help women and prevent an intergenerational cycle of emotional and interpersonal symptoms in infants. Mother-infant dialectical behavior therapy (MI-DBT) has produced promising, yet inconsistent, improvements on quantitative scales of maternal mental health and the mother-infant relationship. The qualitative evaluation may provide complementary information. AIMS: This study aimed to explore the subjective experiences of women who had completed MI-DBT. MATERIAL AND METHODS: Thematic analysis of semistructured interviews conducted on 13 women undertaking MI-DBT before, post, and 12 months after MI-DBT were analyzed for themes. RESULTS: Five major themes were identified. Overall, the women expressed that their emotional literacy and regulation improved after MI-DBT, subsequently addressing key risks and challenges such as uncertainty around their child's cues, and low self-esteem, and potentially improving the women's mentalization capability. DISCUSSION AND CONCLUSIONS: This study consolidates previous research on maternal BPD, and provides qualitative evidence of the benefits of MI-DBT for mothers as both individuals and as parents with likely flow-on effects for infants. Lived experience input for future adaptations was a valuable gain.