How about the bible?
You asked what the Church believes on the matter and I answered (and by the way you will note by a careful reading of the passages from the catechism, Scripture is referenced for the teaching that we are permitted to believe all unbaptised babies go to Heaven)
Again though, the question as asked requires two answers, one strictly theological that reflects Church positive teaching, and another that reflects the Church’s permissive teaching. I will not be drawn into a trap, and neither will the Church, that seeks to equate and thus destroy one (the permissive) by using the other (the positive). Refer to my previous post if there remains any confusion, but in brief, the two are not mutually exclusive.
IOW, in an objective analysis of the point, we are actually in agreement as to the destiny of unbaptised infants, and indeed for the same Scriptural reason (”suffer not the little children to come to Me”), but yet you persist in asking the same question.
I can only conclude two things: Either you didn’t bother to read the passages from the catechism I provided (when asked to do so by the way), or you do not wish to accept the plain truth that they answer your question in full.
The last word is yours, if you need it.