People who are not accountable because of age or mental illness have no need for baptism in the Mormon Church. The great atoning sacrifice of the Savior has paid the price for all their sins, and they will inherit the celestial kingdom.
Self baptism is not authorized. Even the Savior was baptized by another person.
Baptism for the dead is a true doctrine practiced by the early Saints. See 1 Cor. 15:29
If a minor is baptized in the Mormon Church without parental consent, and the parents wish the baptism to be revoked, their demand will be honored.
Baptism in the Mormon Church represents a covenant with God. Childen who are baptized should be nourished in the gospel by family and Ward members until the can understand and comply with the full meaning of the baptismal covenant.
Although the Book of Mormon teaches that it might have been possible for Adam to baptize himself, Joseph Smith’s translation of the Bible clearly shows that Adam was, in fact, baptized by the Holy Spirit.
Unlike black people of African origin, the Mormon Church allowed Australian Aborigines to hold the priesthood.