The child was fatally injured following a two-car collision at Annamarron, Co Monaghan, on the N2, the main Dublin/Derry Rd, at approximately 6.30pm yesterday.
The 36-year-old female driver of the car was critically injured and removed by air ambulance to Tallaght Hospital. Two women, the driver and passenger in the other car, were taken to Our Lady of Lourdes Hospital in Drogheda.
In Cork, 24-year-old Christy Bermingham died after his car crashed into a ditch between Blackstone Bridge and Killeens, just off the N20 near Blarney.
The single-vehicle crash occurred just before 2am yesterday.
Mr Bermingham, a mechanic, was pronounced dead at the scene.
His body was removed to Cork University Hospital where an autopsy took place last night.
Mr Bermingham is survived by his parents Simon and Ann and seven siblings.
In Wicklow, a 40-year-old man was killed when his motorcycle hit a tree. He was pronounced dead at the scene.
His body was removed to St Columcille’s Hospital in Loughlinstown where an autopsy is due to take place.
A second motorcyclist was killed in Armagh on Saturday.
Noel Murphy, aged 36, from Lusk, north Dublin, died after he crashed his bike at the Tandragee racetrack in Armagh.
Racing was suspended for a period of time, but resumed following a request from Mr Murphy’s father who was at the event.
In Donegal, 38-year-old Siobhan Hutcheon, from Ardmore Manor in Muff, was killed instantly when her car was in collision with a Bus Éireann coach on Saturday afternoon.
Three children in the car were rushed to Altnagelvin Hospital in Derry and two are understood to be in a critical condition.
The incident happened just after 3.30pm, between Letterkenny and Newtowncunningham, close to the townland of Ardee.
Ms Hutcheon was pronounced dead at the scene.
Gardaí investigating the accident in Monaghan in which the child lost his life are appealing for witnesses to contact them at Carrickmacross Garda Station on 042 9690190, the Garda Confidential Line 1800 666 111 or any Garda station. They are particularly anxious to speak to the driver of a lorry who stopped at the scene of the collision.