It is a "De Fide" teaching of the Catholic Church that anyone who has the stain of original sin cannot enjoy the beatific vision. The theological debate over the centuries has been about what state the soul of an infant dying with original sin rests in. The prevailing view is that these souls will enjoy perfect happiness even though they do not enjoy the beatific vision.
The prevailing view is that these souls will enjoy perfect happiness even though they do not enjoy the beatific vision. That is not the current prevailing view.
"Baptism of desire" and the "fundamental option" assume that a Just God will give all creatures the opportunity for salvation and the beatific vision.
Just exactly how that is accomplished is pure speculation on our part.