I would like to put the subject of Limbo and take it from the point of view on what we know from the “mind” of God through His beloved Son Jesus–from Scripture and the "private “Novena” of Jesus given to St.Faustina–revealling His Divine Mercy.
From St.Marks Gospel Ch.10 verses 13-16
People were bringing little children to him,for him to touch them.The disciples turned them away,but when Jesus saw this he was indignant and said to them,"Let the little children come to me;do not stop them;for it is to such as these that the kingdom of God belongs.I tell you solemnly ,anyone who does not welcome the kingdom of God like a little child will never enter it.“Then he put his arms round them,laid his hands on them and gave them his blessing.”
SIXTH DAY
Today bring to me THE MEEK AND HUMBLE SOULS AND THE SOULS OF LITTLE CHILDREN
Most Merciful Jesus,You Yourself have said,“learn from Me for I am meek and humble of heart”.Receive into the abode of Your Most Compassionate Heart all meek and humble souls and the souls of little children.These souls send all heaven into ecstacy and they are the heavenly Fathers’ favorites.They are a sweet-smelling bouquet before the throne of God;God Himself takes delight in their fragrance.These souls have a permanent abode in Your Most Compassionate Heart,O Jesus,and they unceasingly sing out a hymn of love and mercy.
Eternal Father,turn Your merciful gaze upon meek and humble souls,and upon the souls of little children who are enfolded in the abode which is the Most Compassionate Heart of Jesus.These souls bear the closest resemblance to Tour Son.Their fragrances rise from the earth and reaches Your very throne.Father of mercy and of all goodness I beg You by the love You bear these souls and by the delight you take in them;BLESS THE WHOLE WORLD,THAT ALL SOULS TOGETHER MAY SING OUT THE PRAISES OF yOUR MERCY FOR ENDLESS AGES. AMEN.
By all means babies should be baptized ASAP after birth or in danger of death—but does not the above give a hope that “**the heavenly’Fathers’ favorites”**who die in the mothers womb or aborted or children dying before reaching the age of reason without Baptism that they too are in Heaven??

:angel1:
I also could have added what Jesus said about leading "his Favorites"astray and how the angels of babies & children are constantly before Him in Heaven–but you know all this!!