There is no agreement on whether people should undergo baptism as an infant (Catholic, Orthodox, Lutheran, Anglicans, Methodists, etc.), as an “believer” after “the age of accountability,” approximately 12 years old (Baptists, Anabaptists, Pentecostal, etc.) or even whether the individual in question must be alive to be eligible for baptism.
Mormons believe that people can be baptised posthumously via proxy and even performed a posthumous proxy baptism on Gandhi.
Infant baptism was historically the most common method of baptism since infant mortality was quite high prior to the 19th century. Paedobaptism is still is still the majority practice among Christians, but the gap beween paedobaptism and credobaptism has decreased because the “urgency” driven by the fear of death has mostly faded due to the advent of modern medicine.
Section on this topic in the Catholic Cathechism:
OCR of the screenshot (from the tweet):
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Since Christ died for all, and since all men are in fact called to one and the same destiny, which is divine, we must hold that the Holy Spirit offers to all the possibility of being made partakers, in a way known to God, of the Paschal mystery.⁶² Every man who is ignorant of the Gospel of Christ and of his Church, but seeks the truth and does the will of God in accordance with his understanding of it, can be saved. It may be supposed that such persons would have desired Baptism explicitly if they had known its necessity.
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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,”⁶³ 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.
Queen of heaven
BTW, over a billion Christians refer to Mary as “Queen of Heaven” yet the only place where the phrase “Queen of Heaven” occurs in the Bible is in reference to a pagan goddess.