Perinatal Mental Health Study (PMHS) India

Inclusion Criteria: For Phase 1 (qualitative study) and Phase 2 (validation study): Pregnant women: * Aged 18 to 45 years * Currently pregnant (any trimester) * Willing and able to give informed consent Post-partum women: * Aged 18 to 45 years * Currently post-partum (between 1-12 months postpartum) * Willing and able to give informed consent Non-perinatal women: * Aged 18 to 45 years * Not currently pregnant and not given birth in the past 12 months * Willing and able to give informed consent For Phase 3 (prospective cohort study): Perinatal women: * Aged 18 to 45 years * In early pregnancy (estimated gestational age \<20 weeks) at recruitment * Not planning to relocate for the duration of the study period * Willing and able to give informed consent * Expressed a willingness to continue to participate for the four planned visits Non-perinatal women: * Aged 18 to 45 years * Not currently pregnant and not given birth in the last 12 months * Not planning to relocate for the duration of the study period * Willing and able to give informed consent * Expressed a willingness to continue to participate for the four planned visits Exclusion Criteria: The participant may not enter the study if: * They have an acutely severe psychiatric illness which impairs their ability to take part in the study * They are not willing or able to provide informed consent Other than for current severe psychiatric illness which affects ability to participate in the study, we will not exclude any participant on the basis of current or prior physical, psychological or psychiatric co-morbidities so long as she is willing to participate, her ability to take part is not compromised and her ability to give informed consent is not impaired by these conditions.