'Suckling' in the Bible

The sword without, and terror within, shall destroy both the young man and the virgin, the suckling also with the man of gray hairs.

Now go and smite Amalek, and utterly destroy all that they have, and spare them not; but slay both man and woman, infant and suckling, ox and sheep, camel and ass.

Therefore now thus saith the LORD, the God of hosts, the God of Israel; Wherefore commit ye this great evil against your souls, to cut off from you man and woman, child and suckling, out of Judah, to leave you none to remain;