Exodus 12:5

5Your lamb shall be awithout blemish, a male a year old. You may take it from the sheep or from the goats,

Leviticus 12:6

6 b“And when the days of her purifying are completed, whether for a son or for a daughter, she shall bring to the priest at the entrance of the tent of meeting a lamb a year old for a burnt offering, and a pigeon or a turtledove for a sin offering,
Copyright information for ESV