‏ Leviticus 12:6

6And when the days of her purification have been completed, for a son or for a daughter, she shall bring to the door of the tabernacle of the testimony, a one-year-old lamb as a holocaust, and a young pigeon or a turtledove for sin, and she shall deliver them to the priest.
12:6The time for bringing the sacrifice to the tabernacle of the testimony is after the days of purification are completed, but it does not specify that the sacrifice has to be made on exactly the next day after those days of seclusion. There is no exact day given, merely sometime after the days of purification. An exact day is not specified so that the mother can use her discretion and prudence, because the child is still very young and needs much care (especially in ancient times, prior to modern medicine).(Conte)
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