Ah, diarrhea at 4 weeks postpartum, please check with your OB or go to the clinic soon, lalo na kung may fever, severe cramping, o malabong stool, okay? Dehydration is a real concern, especially if you're breastfeeding. It can happen postpartum (hormones, diet changes, stress), but kailangan talaga marinig ng doctor kung bakit to rule out infection or other things na need attention. Huwag mag-atubili, better safe, especially ngayon na fragile pa ang recovery mo.