Postpartum mental illness affects as many as 1 in 5 mothers, 1 and can result in maternal suffering and diminished functioning. 2 Related impaired mother-infant interactions are linked to poor social, cognitive and behavioural outcomes in children across their lifespan. 3 When mental illness becomes chronic and recurrent, its effects can extend to the entire family and across generations. 4 With emergence of the novel coronavirus (SARS-CoV-2), the World Health Organization declared a global COVID-19 pandemic on Mar. 11, 2020. Globally, efforts to contain the virus have led to widespread travel restrictions, physical distancing and work limitations, causing broad social and financial disruption that has been associated with substantial mental health effects. 5,6 During the COVID-19 pandemic, people have been reporting concerns about postpartum infection, 7 and difficulty accessing the extended postpartum social support networks and key community programs that protect against mental illness, such as home visits from public health nurses, breastfeeding clinics and support groups, owing to public health measures. 8 In Canadian surveys, about 50% of pregnant people reported psychological distress in spring 2020, 9 and alcohol use increased among women, particularly among those with young children. 10 Whether this represents an increased clinical burden of mental illness or need for care is unknown.Using routinely collected health care data from Ontario, Canada, (population of about 14.6 million), we aimed to examine
RESEARCHMENTAL HEALTH