I’ll note the sermon calls it doctrine, and that the ITC has no authoritative weight it is an advisory commission. Which the sermon linked above goes into.

Am I repeating myself? Yes.
Remember all those theologians who advised Pope Paul VI to drop opposition to contraception?
Here are some quotes, some from the sermon, so spoilers so to speak, but there are more… many many more there. Seriously* listen to the sermon.*
‘Whoever says that infants are alive in Christ even when they depart this life without being baptized is really both opposing the Apostolic preaching and condemning the whole Church which runs hastily with infants to the baptismal font because it is believed without any doubt that otherwise these infants cannot possibly be alive in Christ.’
‘If you want to be a Catholic do not believe, do not say, do not teach that infants carried off by death before being baptized can obtain the remission of original sin.’
St. Augustine, Father, Bishop, Doctor of the Church
The newly born child receives supernatural life through baptism. In the present economy of grace there is no other way to communicate that life to a child who has not obtained the use of reason. Above all the state of grace is absolutely necessary at the moment of death, without it salvation and supernatural happiness, the beatific vision of God, are impossible.
Pope Pius XII, 1951
The Church has shown by her teaching and practice that she knows of no other way apart from baptism for insuring children’s entry into eternal happiness.
Instructions on Infant Baptism, 1980, Sacred Congregation for the Doctrine of the Faith
Q. Where do infants go who die without baptism?
A. Infants who die without baptism go to Limbo, where they do not enjoy the sight of God but also do not suffer, this is because having original sin and this alone they do not merit Heaven but neither do they merit Purgatory or Hell.
Catechism of Christian Doctrine
‘The idea that infants can be granted the rewards of eternal life without even the grace of baptism is utterly foolish.’
Pope St. Innocent I
It will happen, I believe . . . that those last mentioned [infants dying without baptism] will neither be admitted by the just judge to the glory of Heaven nor condemned to suffer punishment, since, though unsealed [by baptism], they are not wicked. . . . For from the fact that one does not merit punishment it does not follow that one is worthy of being honored, any more than it follows that one who is not worthy of a certain honor deserves on that account to be punished.
St. Gregory of Nazianzus, Father, Bishop, Doctor of the Church