Leviticus 12:6

For a burnt-offering—for a sin-offering— The burnt-offering was by way of gratitude to God for her safe deliverance; the sin-offering to complete her purification, and to gain her perfect re-admission to the tabernacle-service. See ch. Leviticus 15:30. While the Israelites remained in the wilderness, it is probable the women brought these offerings immediately after the days of their separation were over. When they were settled in the land of Canaan, and lived at a distance from the temple, convenience, no doubt, was consulted. See 1 Samuel 1:21; 1 Samuel 1:28 and Allix on the Pentateuch.