The announcement on Thursday came as rights group Amnesty called for an urgent formal investigation into new evidence that suggests 796 children, from newborns to eight-year-olds, were deposited without coffins or gravestones, in a grave near a Catholic-run home, which operated from 1925 to 1961.
Historian Catherine Corless, who made the discovery, says her study of death records for the St Mary's home in Tuam in County Galway suggests that a former septic tank near the home was a mass grave.
Kenny has ordered his officials to "draw together a number of senior officials from across the departments until we see what the scale is, what's involved here, and whether this is isolated or if there are others around the country that need to be looked at".
During a trade visit to California, he told reporters that Dublin must decide what is the "best thing to do in the interest of dealing with yet another element of our country's past".
St Mary's, run by the Bons Secours Sisters, was one of several such "mother and baby" homes in early 20th century Ireland.
Another such institution, the Sean Ross Abbey in Tipperary, was where Philomena Lee gave up her son for adoption in the 1950s. Her story was made into the Oscar-nominated film Philomena last year.
In a statement on Tuesday, the Bon Secours sisters, who ran St Mary's, said they were "shocked and deeply saddened" by the reports.
They said they welcomed Dublin's decision to "initiate an investigation, in an effort to establish the full truth of what happened".
The 'mother and baby' homes accommodated women who became pregnant outside of marriage and who were labelled "fallen women" by the unforgiving conservative Catholic society of the time.
Many of the women were ostracised from their own families and had nowhere to turn except to the homes run by nuns.
The babies were often taken from their mothers and adopted or sent to other institutions when they got older.
Conditions were harsh at the homes, with death records showing the children in the Tuam home died from malnutrition, pneumonia and infectious diseases.
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