Numbers 18:16

18:16 And those that must be redeemed you are to redeem when they are a month old, according to your estimation, for five shekels of silver according to the sanctuary shekel (which is twenty gerahs).

Leviticus 27:6

27:6 If the person is one month old up to five years old, the conversion value of the male is five shekels of silver, ¹  and for the female the conversion value is three shekels of silver.

[27:6]  ¹ tn Heb “five shekels silver.”