Today in the Church we remember the innocent children killed by Harod. According to the Gospel of Matthew 2:13-18
Now when they had departed, behold, an angel of the Lord appeared to Joseph in a dream and said, "Rise, take the Child and His mother, and flee to Egypt, and remain there till I tell you: for Herod is about to search for the Child, to destroy Him." And he rose and took the Child and His mother by night, and departed to Egypt, and remained there until the death of Herod. This was to fulfill what the Lord had spoken by the prophet, "Out of Egypt have I called My Son."
Then Herod, when he saw that he had been tricked by the wise men, was in a furious rage, and he sent and killed all the male children in Bethlehem and in all that region who were two years old or under, according to the time which he had ascertained from the wise men. Then was fulfilled what was spoken by the prophet Jeremiah:
"A voice was heard in Ramah, wailing and loud lamentation: Rachel weeping for her children; she refused to be consoled because they were no more."
Note: Scripture readings are from the Revised Standard Version - Catholic Edition