Up to a third of infants died in mother and baby homes in Dublin, Tipperary and Cork in 1933.

Newly released data from the Dublin Archdiocese, show mortality rates in Tuam were either matched or exceeded, by homes elsewhere in the country.

The General Registration Office is to carry out a trawl of death certificates in the hope of establishing the exact number of deaths in all seven mother and baby homes.

Conor Mulvagh is a lecturer in Irish History in UCD - he says the cause of the deaths at the homes is unclear, but there would of been a number of contributing factors.