Musar for Leviticus 12:2

Eve's sin was due to her being seduced by the serpent which had mated with her and introduced its pollutant into her body. The potency of that evil-smelling drop of semen caused her to become subject to menstruation at regular intervals; she therefore had to remain in a state of impurity for seven days, corresponding to the days it took to create the universe. She, after all, had damaged the work of the six days of Creation. When a woman gives birth she is also subject to ritual impurity in a similar way to the impurity of menstruating women, as per Leviticus 12,2. This too is due to the original sin for which she has to suffer great pain when giving birth as per Genesis 3,16.