Read Exodus 12:5 Using Other Translations
Your lamb shall be without blemish, a male of the first year: ye shall take it out from the sheep, or from the goats:
Your lamb shall be without blemish, a male a year old. You may take it from the sheep or from the goats,
The animal you select must be a one-year-old male, either a sheep or a goat, with no defects.