Leviticus 27:6
If the person is from a month old up to five years old, the valuation shall be for a male five shekels of silver, and for a female the valuation shall be three shekels of silver.
Numbers 3:40-43
And the LORD said to Moses, "List all the firstborn males of the people of Israel, from a month old and upward, taking the number of their names.
Numbers 18:14-16
Every devoted thing in Israel shall be yours.
Treasury of Scripture Knowledge
Summary
And if it be from a month old even unto five years old, then thy estimation shall be of the male five shekels of silver, and for the female thy estimation shall be three shekels of silver.
Bible References
From
Numbers 3:40
And the LORD said to Moses, "List all the firstborn males of the people of Israel, from a month old and upward, taking the number of their names.
Numbers 18:14
Every devoted thing in Israel shall be yours.