The Uncleanliness of Women

The Lord said to Moses in Leviticus 12:1-5 that a woman will be twice as unclean after giving birth to a baby girl than to a baby boy.

1Then the LORD spoke to Moses, saying,
2"Speak to the sons of Israel, saying: 'When a woman gives birth and bears a male child, then she shall be unclean for seven days, as in the days of her menstruation she shall be unclean.
3'On the eighth day the flesh of his foreskin shall be circumcised.
4'Then she shall remain in the blood of her purification for thirty-three days; she shall not touch any consecrated thing, nor enter the sanctuary until the days of her purification are completed.
5'But if she bears a female child, then she shall be unclean for two weeks, as in her menstruation; and she shall remain in the blood of her purification for sixty-six days.

Hmmm, did a bronze age people invent these laws and place them in the mouth of God; or is God really that sexist?