The comparison is pointless, Ladislaus, because the case is not the same at all. The children without proper reason do not go to hell but to limbo, and they will live on the surface of the earth at the end of the world. While adults have reason and will go either to hell or to heaven. Therefore the eventuality is not the same at all, you cannot make this comparison...
The argument of MyrnaM is indeed decisive, and when Sister of the Nativity had doubts about the validity of her baptism (a stupid kind of fear) the Lord told her that even if her baptism were invalid, she would benefit from the baptism of desire.