Unwanted, intrusive thoughts of harm-related to the infant are reported by the vast majority of new mothers, with half of all new mothers reporting unwanted, intrusive thoughts of harming their infant on purpose. Thoughts of intentional harm, in particular, are distressing to women, their partners and the people who care for them. While maternal, unwanted and intrusive thoughts of infant-related harm are known to be associated with obsessive compulsive disorder (OCD) and depression, preliminary evidence suggests that they are not associated with an increased risk of harm to infants. Perinatal care providers and policy makers, as well as new mothers and their partners require evidence-based information in order to respond appropriately to these types of thoughts. The purpose of this research is to address important gaps regarding the (a) prevalence and characteristics of intrusive, unwanted thoughts of baby-related harm, (b) their association (or lack thereof) with child abuse, and (c) the prevalence and course of obsessive-compulsive disorder and depression in the perinatal period. Participant were 763 English-speaking women and recruited during pregnancy. In this province-wide study in British Columbia, participants were recruited proportionally from hospitals, city centers and rural communities between January 23, 2014 and September 09, 2016. Participants were administered online questionnaires and diagnostic interviews over the phone at 33-weeks gestation, 7-weeks postpartum and 4-months postpartum. The study assessed intrusive and unwanted thoughts of harm related to the infant, obsessive-compulsive disorder (OCD) and major depressive episode (MDE) disorders and symptomatology, sleep, medical outcomes, parenting attitudes, and infant abuse. There is a scarcity of literature concerning maternal unwanted, intrusive, postpartum thoughts of infant-related harm and their relationship to child harming behaviors, OCD and depression. This longitudinal cohort study was designed to build on the existing research base to ensure that policy developers, child protection workers and health-care providers have the guidance they need to respond appropriately to the disclosure of infant-related harm thoughts. Thus, its main goals will be to investigate whether intrusive postpartum thoughts of infant-related harm are a risk factor for child abuse or the development of OCD.

Background: The anxiety and their related disorders (AD) are the most prevalent of all mental health conditions, disproportionately affecting women. The value of perinatal AD screening is well established but there is very limited evidence to support the applicability of existing anxiety screening instruments. To our knowledge, no previous studies have evaluated an AD screening instrument in a perinatal population using full gold standard methodology. Objective: To assess the accuracy of the most commonly used and/or recommended screening tools for perinatal AD (i.e., the Edinburgh Postnatal Depression Scale (EPDS) and its anxiety subscale (EPDS-3A), and the Generalized Anxiety Disorder 7 and 2-item Scales (GAD-7 and GAD-2) alongside a clinically derived alternative; the Anxiety Disorder - 13 (AD-13). Methods: 310 Canadian women completed mood and anxiety questionnaires at approximately 3-months postpartum. Those scoring at/above cut-off on one or more questionnaire completed a diagnostic interview for depression and all AD (n= 115). The accuracy of each scale was assessed via ROC analyses. Results: Only the AD-13 met the standard of a clinically useful screening measure, with an area under the curve (AUC) above 0.8. This was achieved with and without the inclusion of the related disorders. No other measure demonstrated an AUC above 0.8, either including or excluding the related disorders. Conclusions: Neither the EPDS/EPDS 3-A, nor the GAD-7/GAD-2 can be recommended for widespread use as a perinatal AD screening tool. The high performance of the AD-13 is a good indication that an effective alternative is well within reach.