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"Infant limbo"?  Is that another kind of Limbo?

This is where, I believe, many traditional Catholics get into trouble.  It doesn't matter what we believe as much as what is.

I had sent you a link from Catholic Encyclopedia explaining the entire matter.  Did you simply ignore it?  Every Catholic has heard the distinction between the "Limbo Patrum" (Limbo of the Fathers) ... which you rightly indicate ceased to exist after Our Lord's Resurrection, and the "Limbo Infantium" (Limbo of Infants), which continues on.  Surely you can't be this ignorant of Catholicism to never have heard these two terms before ... or at least the concept.  Every Catholic who has the least bit of catechesis has heard of the notion that infants who die unbaptized go to Limbo.

That last sentence again perplexes me.  With the teaching authority of the Church, "what we believe" conforms to "what is".  As the aforementioned article explains, theologians are nearly unanimous about the fact that unbaptized infants go to Limbo.  So, do you claim to have some better information about "what is" than pretty much nearly every Catholic theologian since the time of St. Thomas?

The Church has never defined dogma on such.

Oh, the Church most certainly has ... as cited by another poster above.  This is UNANIMOUS consensus of all Church Fathers from the beginning.  Now, for a while theologians, following St Augustine, posited that infants who died unbaptized go to Hell, but theologians reconsidered this and, since the time of St. Thomas, it's nearly undisputed.

Nevertheless, despite historical controversy about the details of where they do actually go, it's been dogmatically defined and taught repeatedly that those who die in Original Sin alone cannot go to Heaven.  In other words, it's dogmatically certain where they do NOT go, i.e. to Heaven.

Pope Eugene IV, Council of Florence, Letentur coeli
“We define also that… the souls of those who depart this life in actual mortal sin, or in original sin alone, go straightaway to hell, but to undergo punishments of different kinds.”

That's pretty clear to me...

Limbo is a part of Hell, so the belief of Limbo of the Innocents doesn't violate this