The document discusses uterine involution and subinvolution after pregnancy. During involution, the uterus reverts back to its non-pregnant size of 7.5cm in length and 60g in weight. Subinvolution occurs when this process is impaired or retarded. Risk factors for subinvolution include grand multiparity, over-distension of the uterus, maternal ill health, cesarean section, uterine fibroids, and retained products of conception or uterine sepsis. Symptoms of subinvolution can include abnormal or prolonged bleeding. Treatment depends on the underlying cause, such as antibiotics for endometritis, uterine exploration for retained products, or medications to enhance involution.