The catholic church would not allow the parents to bury their daughter in cosecrated ground. She was a dear friend of mine, when she committed suicide in 1965. They made the same decision (including the limbo, mumbo jumbo) about my wife's first child, who was born dead, without being baptised, in 1970. During my lifetime, they also stopped requiring latin mass, and meatless Fridays. I have no idea what their current teachings are, but if I had been catholic, I would have told them long ago that they were short on compassion and long on dogma....and to let me know when they finally decided just what displeases god this year.
Prior to the 1960s (and it appears in some places even during the 1960s) Catholic funeral masses were said for victims of suicide, but because it is a grave sin, burial in a Catholic cemetery
at that time would have been cause for scandal--as were burials of divorced and remarried Catholics. Since then, the world has learned more about the mental health of many suicide attempts.
"Limbo" was never a place for infants. "Limbo" was the state the Church was in when it was asked about the fate of unbaptized babies. Scripture does not address this situation, so the Church cannot say, "This happens" or "That happens." The Church simply entrusts the situation to God. The usual practice is that if the parents were baptized and intended to have their child baptized (i.e., attended the baptismal classes) babies would be in the same situation as catechumens preparing for adult baptism. Burial in a Catholic cemetery is permitted in both cases.
Masses were said in Latin, because this dated back centuries when Latin was the common language nearly everyone understood. The Church elected to use the common language, rather than an elite language.
Meatless Fridays were about forming a bond and understanding with the poor. It went hand-in-hand with alms giving.
The Church has always taught compassion, but equally, has always pointed to the ideal. Suicide is not the ideal. In the last fifty years with more knowledge available, there are Catholic ministries to support family and friends of suicide victims.