Sean Ross Abbey in Roscrea Co Tipperary was a Mother and Baby Home, and one of the largest of these institutions in the State.
The home was run by the nuns from the Sisters of the Sacred Hearts of Jesus and Mary from 1930 until 1970.
Thousands of unmarried pregnant women passed through their doors and official figures show that 5,252 babies were born there.
In 2011, the order of nuns handed over all their records to the Health Service Executive and subsequently Tusla.
In these records only one death register exists.
It shows the names of 269 babies who died there.
However, RTÉ Investigates reveals the true figure was in fact multiples of this; at least 1,000 babies are registered as dying in Sean Ross Abbey.
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