You're right PSac, I meant "wasn't". Regarding the event, wikipedia has this to say:
"Regarding the Massacre of the Innocents, although Herod was certainly guilty of many brutal acts, including the killing of his wife and two of his sons, no other known source from the period makes any reference to such a massacre. [ 13 ] Since Bethlehem was a small village, the number of male children under the age of 2, would probably not exceed 20. This may be the reason for the lack of other sources for this history, [ 14 ] although Herod's order in Matthew 2:16 includes those children in Bethlehem's vicinity making the massacre larger numerically and geographically.
The only other canonical gospel to give an explicit nativity narrative, the Gospel of Luke, places the birth of Jesus ten years after Herod's death, during the Census of Quirinius, and as such makes no mention of Herod or any Massacre of the Innocents."