Typical Nature of Paschal Lamb: A Male of the First Year
Source: TTT
Exodus 12:5
Your lamb must be an unblemished year-old male, and you may take it from the sheep or the goats.
Isaiah 9:6
For unto us a child is born, unto us a son is given, and the government will be upon His shoulders. And He will be called Wonderful Counselor, Mighty God, Everlasting Father, Prince of Peace.