has birth and baptism records but they do charge a fee. They are free to view in Dublin but I take it you don't live here in Ireland.
I would start searching in the parish where you noticed the Morans and Scanlons together.
Judging by the names Moran and Scanlon, I would assume Mary was Catholic and converted to the Church of Scotland in order to marry.
The very young boy born before the marriage may have been brought back to his grandparents in Ireland.