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The response in the Summa is as follows:In time the notion of “suffering less” became “not suffering at all” and even “having as much happiness as one can have outside of Heaven.” This afterlife was envisioned as taking place on the outer borders of Hell, and thus the region became known as Limbo (from the word for a border or fringe). That led to the strange circumstance of a part of Hell whose inhabitants were happier than anyone on Earth.
"Objection 1. It would seem that souls which depart with none but original sin, suffer from a bodily fire and are punished by fire. For Augustine [Fulgentius, De Fide ad Petrum, xxvii] says: “Hold firmly and doubt not that children who depart this life without the sacrament of Baptism will be punished everlastingly.” Now punishment denotes sensible pain. Therefore souls which depart this life with original sin alone, suffer from a bodily fire and are tormented with the pain of fire.
. . .
Reply to Objection 1. In the authority quoted punishment denotes, not pain of sense, but only pain of loss, which is the privation of the divine vision, even as in Scripture the word “fire” is often wont to signify any kind of punishment."
Read more here: newadvent.org/summa/6001.htm
The solution of a Limbo of the Infants is personally appealing to me because it does away with the possibility that God would condemn infants free of actual sin to eternal torment rather than simply hoping that God might see fit to spare them if he feels like it.