Infants would give praise to the Messiah.
OT Prophecy NT Fulfillment
Psalm 8:2
Out of the mouth of babes and sucklings hast thou ordained strength because of thine enemies, that thou mightest still the enemy and the avenger.
Matthew 21:15–16
[15] And when the chief priests and scribes saw the wonderful things that he did, and the children crying in the temple, and saying, Hosanna to the Son of David; they were sore displeased,
[16] And said unto him, Hearest thou what these say? And Jesus saith unto them, Yea; have ye never read, Out of the mouth of babes and sucklings thou hast perfected praise?
Tanakh – Ketuvim – Psalms 8:3
Out of the mouth of babes and sucklings hast Thou founded strength, because of Thine adversaries; that Thou mightest still the enemy and the avenger.
Hebrew OT – Psalms 8:3
[8:3] מִפִּי עוֹלְלִים וְיֹנְקִים
יִסַּדְתָּ עֹז
לְמַעַן צוֹרְרֶיךָ
לְהַשְׁבִּית אוֹיֵב וּמִתְנַקֵּם