What does Leviticus 12:6 mean?

And when the days of her purifying are fulfilled, for a son, or for a daughter, she shall bring a lamb a year old for a burnt-offering, and a young pigeon, or a turtle-dove, for a sin-offering, unto the door of the tent of meeting, unto the priest:

And 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, unto the door of the tabernacle of the congregation, unto the priest:

And when the days of her purifying are fulfilled, for a son, or for a daughter, she shall bring a lamb a year old for a burnt-offering, and a young pigeon, or a turtle-dove, for a sin-offering, unto the door of the tent of meeting, unto the priest:

And when the days are ended for making her clean for a son or a daughter, let her take to the priest at the door of the Tent of meeting, a lamb of the first year for a burned offering and a young pigeon or a dove for a sin-offering:

`And in the fulness of the days of her cleansing for son or for daughter she doth bring in a lamb, a son of a year, for a burnt-offering, and a young pigeon or a turtle-dove for a sin-offering, unto the opening of the tent of meeting, unto the priest;

And when the days of her purification are expired, for a son, or for a daughter, she shall bring to the door of the tabernacle of the testimony, a lamb of a year old for a holocaust, and a young pigeon or a turtle for sin: and shall deliver them to the priest.

And when the days of her cleansing are fulfilled, for a son or for a daughter, she shall bring a yearling lamb for a burnt-offering, and a young pigeon or a turtle-dove for a sin-offering, to the entrance of the tent of meeting, unto the priest.