Gardaí are not currently seeking anyone else in connection with the deaths.
The body of a woman and an infant boy have been discovered in Dublin today.
The woman's body was found at Lower Road, Strawberry Beds in Lucan at 3:45 am after reports of a pedestrian seen acting suspiciously at the M50 toll plaza bridge.
Following this incident, Gardaí went to a house in Lucan where an 7-month-old baby boy was found in an unresponsive condition.
He was pronounced dead at the scene a short time later.
The results of post-mortem examinations will determine the course of Garda investigations.
At this stage investigating Gardaí are treating these incidents as a Family tragedy and are not currently seeking anyone else in connection with the deaths.