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Motherhood represents a veritable crisis: the process of becoming a parent demands a renegotiation of the maternal imagoes that can disrupt the identity of mothers already afflicted by borderline pathology, and may have an impact on the quality of their attachment behaviors toward the expected child. This article presents an evaluation of the attachment behaviors of 13-month-old babies of mothers presenting a borderline personality disorder (BPD). This evaluation was part of a longitudinal prospective study of a cohort of mother-baby dyads comprising 14 mothers presenting BPD with or without depressive episode(s), and 13 “control” mothers without disorders. The quality of attachment patterns at 13 months was evaluated using the Strange Situation Classification (Ainsworth et al. 1978), as part of a research study that aimed more broadly to clarify how such attachment behaviors are rooted in specific dysfunctional mother-child interactions at three months, as reported in other publications. Our results show that the children in the control group are generally very consistent in the expression of their attachment behaviors during the course of the Strange Situation. On the contrary, the babies in the BPD group display a variety of behaviors that would make it yet more difficult for their mothers to anticipate their reactions. We thus observed more insecure and disorganized attachment behaviors among the BPD group of babies. Such disorders in attachment behavior amplify already existing weaknesses in the mother-baby relationship.