The law, in the RSA’s words
These four rules are quoted word for word from the RSA:[1]
- “Drivers have a legal responsibility to ensure that all passengers under 17 are appropriately restrained in the vehicle.”
- “All children under 150cm in height or 36kg in weight must use a child restraint system (CRS) suitable for their height and weight while travelling in a car or goods vehicle (except taxis).”
- “It is illegal to place a rear-facing child car seat in the front passenger seat where there is an active airbag.”
- “Children must travel in a rear-facing car seat until they are at least 15 months old.”
The legal duty sits with the driver.[1][3]
Citizens Information says the fine for not wearing a seat belt is €120, with 3 penalty points if you pay on time. Not using a suitable child seat is also an offence.[3]
Children must stay rear-facing until they are at least 15 months old, and a rear-facing seat must never go in a front seat with an active airbag.[1] The Road Safety Authority (RSA) recommends keeping children rear-facing for as long as possible and in a car seat until 150 cm, whatever they weigh. Its Check it Fits service will check your seat for free.[1][2]
The free option first: get it checked
Over half of the seats the RSA’s Check it Fits team look at are fitted wrongly, it says.[2] The service is free and nationwide. It visits all 26 counties twice a year and you do not need to book: “simply come along”. The team checks the fit, shows you how to fit it yourself and answers questions.[2]
If you cannot get to an event, you can ask the RSA for a call back. Its experts can advise over a WhatsApp video call, but the RSA says a video call “cannot replace an in-person child car seat check”.[2] You can also sign up for an email about two weeks before the team visits your county.[2]
Which seat, and when to move up
Go by your child’s height and weight and the seat maker’s limits, not by age. If your child goes over either the height limit or the weight limit of their seat, they have outgrown it.[1]
Rear-facing. The law says at least 15 months. The RSA advice is to stay rear-facing “for as long as possible (often up to age 4 or beyond)”. Switch only when your child outgrows the seat’s rear-facing limits.[1] Rear-facing seats give better protection to a child’s head, neck and spine.[4]
Booster seats. The RSA’s guide heights are:[1]
- High-back booster: recommended for children between 100 cm and 150 cm.
- Backless booster: recommended for children between 125 cm and 150 cm.
A high-back booster also protects the head and sides, so the RSA says to use it for as long as possible.[1] The seat belt should sit across the shoulder, not the neck, and across the pelvis, not the stomach.[1]
Leaving the seat behind. A child can legally stop at 150 cm or 36 kg. The RSA’s advice is to keep using a seat until 150 cm, “regardless of weight”.[1]
Fitting it: the two-minute check
Read both manuals: the seat’s and your car’s.[4] Then the RSA suggests this check:[1]
- Movement test. Hold the seat at the base and try to move it side to side and forward. It should not move more than about 2 to 3 cm. More than that is too loose.
- ISOFIX. Both connectors fully clicked in. Listen for the click and look for the green indicator.
- Seat belt fitting. The belt goes exactly where the manual shows and is pulled tight with no slack.
Watch for “buckle crunch”, where the car’s seat belt buckle rests on the frame of the child seat. The RSA warns the buckle could open while you drive, or break in a crash.[1]
The harness should be “snug, flat and not twisted”. Take off bulky coats and puffy jackets first: the padding can squash in a crash and leave the harness loose.[4]
Only use extras that came with the seat or that its maker approves. Head supports, harness pads and toys clipped to the straps may change how the seat works in a crash.[4]
The front seat and airbags
The back seat is safest. If a child must sit in front, the RSA says to use a forward-facing seat suited to their height and weight, put the passenger seat as far back as it goes, and choose “the biggest and strongest child”.[1]
A rear-facing seat in the front needs the passenger airbag switched off. An airbag can hit the back of the seat “with significant force, resulting in serious or fatal injuries”, the RSA says.[1]
i-Size, R129 and older R44 seats
Since 1 September 2024, shops, marketplaces and online sellers in the EU can only sell seats approved to R129, also called i-Size.[4] You can still use an R44 seat you bought before then. Look for the orange “E” mark label, which shows R44/04 or R129.[1]
ISOFIX is how a seat fixes to the car. i-Size is the safety standard the seat is built to.[4]
A seat bought abroad is fine in Ireland if it is approved to R129, or to R44/04 if bought before September 2024.[1]
Second-hand seats
The RSA says buying new is safest. A second-hand seat can be safe only if all of these are true:[1]
- You know its full history.
- It has never been in a crash, even with no visible damage.
- It is within its expiry date, usually 5 to 10 years. Check the sticker or the date stamped in the plastic.
- It has all its parts and instructions.
- It comes from someone you trust, such as family or a close friend.
- It has the orange E mark for R44/04 or R129.
After a crash, replace the seat even if it looks fine. The RSA says to ask the seat’s maker if the car had more than bumper damage. Cut the straps before you dispose of the old seat so nobody else uses it.[1]
Taxis, buses and three across the back
Taxis and buses do not have to provide child seats. With the driver’s or company’s agreement you can fit your own. Some companies let you book a seat in advance.[1] The RSA calls it “very dangerous” for a child to travel on an adult’s lap.[1]
Not every car takes three seats across the back. The RSA advises trying the seats in your car before you buy, and its Check it Fits team can advise on combinations.[1]
Which situation are you in?
A newborn’s first journey home. Use a rear-facing infant seat in the back, or in the front with the airbag off. If your baby was premature or small at birth, ask the hospital to check they can travel in the seat before you leave.[1][4]
Your toddler’s legs touch the back seat. That is not a reason to turn them. Stay rear-facing until they reach the seat’s rear-facing height or weight limit.[1]
A grandparent collects the children. The driver is responsible, so make sure the right seats move cars too and are fitted again properly.[1]
A taxi from the airport with a baby. Bring your own seat or book one with the taxi firm well in advance.[1]
A child who keeps wriggling out. Check the harness is adjusted to the maker’s instructions and your child is comfortable. Badly adjusted straps are a common cause.[4]
A quick stop at the shop. Never leave a child alone in the car, even for a few minutes. The RSA lists overheating, fire, getting trapped by electric windows and the car moving.[4]
Why we do not recommend a seat
prepared.ie does not pick car seats. The right seat depends on your child, your car and how it is fitted, and we cannot test that. Use the RSA’s free Check it Fits service, and buy where the seat can be fitted and you are shown how. The RSA advises shops signed up to its Code of Practice.[1][2]
If a child is in danger in or near a car, call 112 or 999.
Cannot make a voice call? Text 112.
The emergency text service can be used by "anyone who is not able to make a voice call due to a speech or hearing impairment or other situations where a voice call might not be possible". It works "from any Irish registered mobile phone (either pre-pay or bill pay) on all the Irish Mobile networks". If you can talk, ring instead: a text is slower.
Your text needs four things:
- Which service: Ambulance, Coastguard, Fire or An Garda Síochána.
- What the problem is.
- County you are texting from.
- Where help is needed: town, road, Eircode or a landmark.
Wait for a reply: "an SMS/Text 'Delivery Report' does not mean your message has been received". If no reply comes within 3 minutes, send another message straight away. It does not work from a foreign phone, or from an Irish phone roaming abroad, including in Northern Ireland.
No registration is needed. 112.ie says: "There is no preparation or registration required to use either Emergency SMS, or RTT when contacting the ECAS." If you might need to text one day, you can choose to give the service your address, access details and a next of kin in advance at 112.ie/register. Most smartphones can also use Real-Time Text to type during a call to 112 or 999: turn on RTT in your phone’s accessibility settings.
Source: 112.ie, emergency text service, sending a text to 112, SMS questions and answers, emergency SMS terms and conditions and Real-Time Text pages, checked 1 November 2026.
Common questions
How long does my child have to stay rear-facing in Ireland?
By law, until they are at least 15 months old, and the RSA advice is to stay rear-facing for as long as possible, often to age 4 or beyond.[1]
When can my child stop using a booster seat?
The law allows it at 150 cm or 36 kg, but the RSA advice is to use a car seat until 150 cm whatever your child weighs.[1]
Is my old R44 car seat still legal?
Yes, if you bought it before 1 September 2024, because only the sale of R44 seats stopped then.[4]
Can my child sit in the front seat?
There is no law against it if they use a seat suited to their height and weight, but a rear-facing seat must never go in front of an active airbag and the back seat is safest.[1]
Where can I get my car seat checked for free?
At the RSA’s Check it Fits service, which visits every county twice a year with no booking needed.[2]
Data sources (5), all checked 2026-11-01
Footnotes
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Road Safety Authority, Child safety in cars: frequently asked questions. The law, rear-facing, boosters, airbags, second-hand seats and taxis; legal rules quoted verbatim. Checked 2026-11-01. ↩ ↩2 ↩3 ↩4 ↩5 ↩6 ↩7 ↩8 ↩9 ↩10 ↩11 ↩12 ↩13 ↩14 ↩15 ↩16 ↩17 ↩18 ↩19 ↩20 ↩21 ↩22 ↩23 ↩24 ↩25 ↩26 ↩27 ↩28 ↩29
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Road Safety Authority, Check it Fits. Free nationwide fitting checks, call backs and email alerts. Checked 2026-11-01. ↩ ↩2 ↩3 ↩4 ↩5 ↩6 ↩7
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Citizens Information, Seat belts when motoring in Ireland. Child restraints, enforcement, fines and penalty points. Checked 2026-11-01. ↩ ↩2
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Road Safety Authority, Child safety in cars. Golden rules, bulky clothing, accessories, R44 and R129, unattended children, premature babies. Checked 2026-11-01. ↩ ↩2 ↩3 ↩4 ↩5 ↩6 ↩7 ↩8 ↩9 ↩10
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112.ie, SMS questions and answers. Checked 2026-11-01. ↩
prepared.ie is independent and is not affiliated with the Government of Ireland, the Road Safety Authority or any agency. In an emergency, call 112 or 999.[5]
