The history of the months and years after our Lord's Birth - especially related to the time of the appearance of the star, the slaughtering of the Holy Innocents and the flight into Egypt.
The star appeared to the Magi on the night our Lord was born, however, Herod only slaughtered the holy innocents two years later. Further, the children killed were not all those under the age of two, but only the boys from about 20 months down to about 11 months of age, born in the region of Bethlehem -- this could have been as few as half a dozen, and not likely more than two dozen.
The Holy Innocents are not so much a parallel for children killed by abortion today, but rather an example for those who are baptized as infants -- although they do not yet have the use or reason and are not able to make an explicit act of faith, because they are conformed to Christ's death (either through martyrdom or through baptism), they are incorporated into Christ and find salvation through him!
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