Leviticus 12:5-6

5But if she shall bear a girl, then she shall be unclean two weeks, as in her separation: and she shall continue in the blood of her purifying sixty and six days.

6And when the days of her purifying are fulfilled, for a son, or for a daughter, she shall bring a lamb of the first year for a burnt offering, and a young pigeon, or a turtledove, for a sin offering, to the door of the tabernacle of the congregation, to the priest:1