The size of the uterus
remains bulkier than normal after child birth and this can be the cause for the excessive bleeding owing to a larger surface area that bleeds. Apart from this, hormones and polyps are also the likely causes. The passage of large clots is suggestive of heavy bleeding; smaller clots are a normal phenomena as clotting occurs as the blood stays for a longer period while passing through the vagina. Anemia
, infections are some other possible reasons. Evaluation and proper management are needed. Take care.