Q. 1. I recently heard from a parishioner that those who are aborted, they are saved through baptism by blood. Is this a new Catholic doctrine?
A. 1. This is another heresy that is promoted by those Catholics who claim that God's mercy will save everybody.
Paragraph # 1261 of the Catechism of the Catholic Church is very clear regarding those who are not baptised,
"As regards children who have died without Baptism, the Church can only entrust them to the mercy of God, as she does in her funeral rites for them. Indeed, the great mercy of God who desires that all men should be saved, and Jesus' tenderness toward children which caused him to say: "Let the children come to me, do not hinder them," allow us to hope that there is a way of salvation for children who have died without Baptism. All the more urgent is the Church's call not to prevent little children coming to Christ through the gift of holy Baptism."
Baptism of blood is the shedding of one's blood for the faith of Christ. He who has the intent of being baptised, but dies as a martyr while preaching the Gospel before receiving the Sacrament, he has received the Baptism by blood. The aborted do not meet this condition since it cannot be proven that they intended to be baptised, and it can be affirmed that they were not preaching the Gospel.
Only heretics would distort this teaching of the Catholic Church in order to confuse the believers.