What does it mean to offer Mass for the repose of the soul? It means that these souls are in Purgatory. But the little children today are not in purgatory as such because they have no personal sins; they only have the original sin of Adam.
And in this question, the Church has not yet clarified definitively the issue of unbaptized children. Either they are already born and baptized or unborn unbaptized children; what is the destiny of these in eternity? But surely, they will not be condemned because they did not have personal sins to expiate.
Usually, the Mass for the souls reposed are Masses for the expiation of personal sins. Therefore, I think such a Mass intention is not correct. It would be better to make a Mass intention for the expiation, for the reparation, of the sins of these horrible acts, which were done on these unborn children.
It is for those people who did these horrible acts, for their souls, that they will not be condemned, for example; or that they will convert; or if they are already in the other world deceased, for the forgiveness of sins. There is also a special Mass in the missal for the forgiveness of sins.
Dear visitors of Gloria Dei and all who have already written or who will write a personal message to me. I am grateful for your attention, your kindness, for your spiritual support and especially for your sacrifices and prayers for me. God may reward you!