One issue that I am having difficulty with is the notion of infant baptism. I have seen some persuasive arguments against the practice, and would just like to learn more about the arguments for infant baptism, especially since it is very interesting that all of the most ancient Christian churches (Roman Catholic, Eastern Orthodox, Oriental Orthodox, etc) practice it.
Does anyone know the earliest mention of infant baptism from the Church Fathers? What is the Biblical basis for the practice? Is there any correlation with Old Testament practices? From what I understand, Orthodox practice baptism by immersion as the standard with pouring as the exception, correct? This seems to be more in line with what the Bible states, as well as what the Didache states as well (pouring being done if immersion cannot).
Also, what do Orthodox believe infant baptism does? Perhaps this ties into a question of "original sin". From my understanding, Catholics believe that if an infant dies without baptism, then they may not go to Heaven, though they hope for that, hence why Limbo of Infants was speculated on, and why the Catholic Catechism leaves that question up to the mercy of God. How do Orthodox view that situation (a question that seems to be related to what Orthodox believe baptism does to an infant (though I also assume that what it does is the same thing that it does to an adult)).
Thank you for your answers!