Here is an excellent article on whether if infants who die before being baptized may go to hell or not. As a Chaplain I had been asked this question many times by parents and family members.
Do infants go to hell if they die before baptism? The Doctrine of Original Sin Re-examined.
Fr. Panayiotis Papageorgiou, Ph.D. Dec 6th, 2013
“The doctrine of Original Sin has been circulating for about 1600 years but it is not supported scripturally or theologically by the tradition of the Early Christian Church. It is a theological development mistakenly introduced by St. Augustine…
Historically speaking, this idea was propagated through the centuries by the Roman Catholic Church. They received this teaching from the great saint and doctor of the Western Church St. Augustine, who had based his anthropology on the concept of “traducianism”.”