The Association Between Gut Microbiota Diversity and Postpartum Depression

This study looks at whether differences in gut bacteria (microbiome) during and after pregnancy are linked to postpartum depression. Researchers will collect rectal swab samples at the time of a planned cesarean delivery and follow participants to track mood symptoms afterward. **You may be eligible if...** - You are 18 or older - You are at least 36 weeks pregnant and planning a cesarean delivery - You can understand the study procedures and give consent - You are willing to provide a rectal swab sample **You may NOT be eligible if...** - You have a gastrointestinal condition or have recently taken antibiotics that could change your gut microbiome - You have a severe mental illness (such as schizophrenia, bipolar disorder, or major depression with psychosis) - You took antidepressants, antibiotics, or fish oil supplements during pregnancy - You refuse to provide rectal swab samples Talk to your doctor to see if this trial is right for you.