'Sucklings' in the Bible

And Nob, the city of the priests, he smote with the edge of the sword, both men and women, infants and sucklings, and oxen, and asses, and sheep, with the edge of the sword.

Out of the mouth of babes and sucklings hast thou established praise because of thine adversaries, to still the enemy and the avenger.

and said to him, Hearest thou what these say? And Jesus says to them, Yea; have ye never read, Out of the mouth of babes and sucklings thou hast perfected praise?