Leviticus 12:5

5. Maid child… threescore and six days It has not pleased God to disclose the ground of this different legislation for the sexes by doubling the period of purification after the birth of a female child. The sexes are equally honoured in the decalogue. Though woman was first in transgression, sin is not thereby more deeply ingrained in her nature, for St. Paul implies that Eve’s sin was less heinous than Adam’s, inasmuch as she was deceived, while he transgressed with his eyes wide open to the character and consequences of his act. 1 Timothy 2:14. We are not satisfied with Keil’s theory, that the ancients supposed that the impure discharges continued longer after the birth of a girl. Since this is an attested physiological fact, the all-wise God did not inflict a needless disability of forty additional days. It may also have been that both mother and daughter required double time for purification as all equivalent to the circumcision of the male child.