10 Best Toddler Car Seats 15 Months Upwards With Isofix in The UK

Last updated on 07/08/2025

Advertising disclosure

Maxi-Cosi Titan S i-Size, Child Car Seat, 15 months-12 years (76-150cm), ISOFIX Car Seat, 5 Recline Positions, 13 Headrest Positions, G-CELL Protection, 5-Point Safety Harness, Tonal Black

Free Shipping

Why We Love It

Grows with your child.
Top EU safety standards.
Five comfortable recline positions.

Main Highlights

GROUP 1/2/3 CAR SEAT: this forward-facing car seat is suitable from 15 months up to 12 years, 76-150cm (9-36kg) – keeping your little one safe throughout childhood
I-SIZE SAFETY: this kids car seat is built according to the highest EU safety standards (ECE R129/03) – its ISOFIX connectors and top tether ensure secure installation of the seat in your car
G-CELL SIDE IMPACT PROTECTION: an extra-protective built-in guard in the sides of the car seat spreads the forces on side impact away from your child and reduces injury to the head, neck and shoulders
5 RECLINE POSITIONS: its multiple recline positions help ensure your child rides in comfort on every journey – whether they're sitting up window-gazing or wind down in a more laid-back position
13 HEADREST POSITIONS: the Titan S i-Size grows with your child thanks to the adjustable headrest and high back booster design – your little one is safe and comfortable wherever you go
5-POINT SAFETY HARNESS: use the adjustable harness up to 4 years, after which the child can be installed with the car's seat belt - the harness can be stored in the backrest
100% RECYCLED FABRICS: the sustainable car seat cover is designed with Eco Care, which means the cover consists of 100% recycled fabrics – it can easily be removed and is machine washable
COMPATIBLE ACCESSORIES: you can combine the Titan S i-Size toddler car seat with its car seat cover, a back seat car seat mirror and/or back seat protector to make the best out of your family travels

CYBEX Silver child car seat Pallas B2 i-Size, ISOFIX, Group 1/2/3 (9-50 kg), From approx. 15 months to 12 years, Incl. cup holder, Blue Moon

Free Shipping

Why We Love It

Sturdy and durable for years.
Patented safety features ensure protection.
Easy to install and clean.

Main Highlights

Sturdy and high-quality child car seat, Long-term use for children aged approx. 15 months to approx. 12 years (9-50 kg)
Patented 3-way adjustable headrest, Reinforced side impact protection to absorb impact forces to protect the head and upper body
One-handed seat adjustment, Optimal breathability and all round air circulation so that they are content even on longer rides
Easy to install in the car with ISOFIX and Top Tether, User-friendly seat belt system, Machine washable fabric cover (30°C), Optional accessories sold separately: Summer cover
Contents: 1 Pallas B2 i-Size car seat, Dimensions (LxWxH): 42 x 53 x 59.5 - 83 cm, weight: 6.5 kg, Colour: Blue Moon

Maxi-Cosi Nomad Plus, Foldable Car Seat, 15 Months – 4 Years, 76 - 105cm , Portable Travel Car Seat, Ultra-Compact & Lightweight, Side Impact Protection, Fits any Car, Travel Bag, Authentic Black

8% OffFree Shipping

Why We Love It

Ultra-compact and lightweight design.
Quick universal installation feature.
Washable fabric for cleanliness.

Main Highlights

GROUP 1 CAR SEAT: this foldable toddler car seat is suitable from 15 months up to approx. 4 years (9–18kg) and is quick to install and easy to carry, so your child travels safely in comfort
EASY TO TRAVEL EVERYWHERE: the Nomad Plus is built for travelling as it's super easy to fold, has an integrated handle and comes with a water repellent travel bag
ULTRA-COMPACT AND LIGHTWEIGHT: the child car seat is ultra-compact and lightweight (4,26 kg), which makes it super easy to carry so your child can travel safely in comfort, everywhere you go
QUICK UNIVERSAL INSTALLATION: Nomad Plus fits any car with its belt installation and takes less than 30 seconds to install thanks to the belt routine ensuring correct installation of the car seat
SIDE IMPACT PROTECTION: with the seat's reinforced Side Impact Protection, you can relax knowing that your child is fully protected and safe when you bring your trusted child car seat with you
SOFT FABRICS AND COMFORTABLE PADDING: nestled in its soft fabrics and extra-comfy padded seat, your little one will always be snug and comfortable travelling from one adventure to the next
EASY HARNESS & HEADREST ADJUSTMENT: thanks to the easy adjustment of the safety harness and headrest height, the Nomad Plus provides extra safety and comfort over the years as your child grows
5-POINT SAFETY HARNESS: the Nomad Plus has a 5-point safety harness with anti-slip shoulder pads, keeping your growing child safe and stable at all times (suitable up to 4 years)
WASHABLE FABRICS: the car seat's easy-to-remove fabrics are machine washable at 30 degrees, allowing you to keep the car booster seat clean during all those family travels
INCLUDED ACCESSORIES: the integrated water repellent travel bag makes travelling easy – even when you have your hands full, you can pack the Nomad Plus away and throw it over your shoulder

Joie Spin 360 R44 Rotating Combination Group 0+1 ISOFIX Car Seat (Birth - Approx 4 Years, 0-18kg), Ember

27% OffFree Shipping

Why We Love It

Simple 360º spin for accessibility.
Grows with your child.
Flawless installation every time.

Main Highlights

SIMPLE 360º SPIN for easier ins & outs: getting in and out of the car with your little one just got easier; simply spin the car seat to the optimum position you need for the easiest access to place your baby without reaching over the side of the car seat; then spin it back to the safest position for traveling
Grow together: a smarter headrest & harness; the Grow Together multi-height headrest and harness system adjusts as one and never asks you to rethread a harness; optimum when you want a car seat that intuitively grows alongside your little one
Get a flawlessly firm install; get a hassle-free, flawlessly firm install every time with ISOFIX connectors that do the hard work for you
Fits even more vehicles: the rebound bar-free design makes the spin 360 one of the smallest swivel seats on the market; it also makes it the optimum option when you need to fit compact spaces, save space in the backseat, or fit multiple seats into a small car

CYBEX Gold child seat Solution S2 i-Fix, For cars with and without ISOFIX, 100 - 150 cm, From approx. 3 to 12 years (15 - 50 kg), Moon Black

29% OffFree Shipping

Why We Love It

Built-in side impact protection.
Height-adjustable headrest.
Machine washable cover.

Main Highlights

Stable and high-quality child seat with a long service life - For children aged approx. 3 to 12 years (15-50 kg), Latest generation of the Solution S i-Fix
Maximum safety: Built-in side impact protection (L.S.P. System), Adjustable headrest, Energy-absorbing shell
12-position height-adjustable headrest, Adjustable backrest, Extra wide and deep seat cushion, Air circulation system for comfortable body temperature
Easy to install in the car with vehicle seat belt and optional ISOFIX for extra stability, Machine washable cover (30°C), Optional accessories sold separately: Summer cover and cup holder
Contents: 1 car seat Solution S2 i-Fix, Material cover: 100% polyester, Dimensions (LxWxH): 40.5 x 50.0 x 61.0 cm, Weight: 6.2 kg, Colour: Moon Black

Graco Energi i-Size R129 ISOFIX/Top Tether Harness Booster 76-150cm (15 Months to Approx.. 12 yrs). Harness Mode 76-105cm (15 Months to 4 yrs), Highback Booster Mode 100-150cm (3.5 to 12 yrs), Meteor

8% OffFree Shipping

Why We Love It

Maximum safety standards achieved.
Easily adjustable ISOFIX installation.
Transforms with your child.

Main Highlights

i-Size and R129 safety - This harness booster meets i-Size and R129 standards. This means Energi i-Size R129 has undergone more extensive side impact testing and is compatible with any i-Size approved vehicle
ISOFIX and top tether for extra safety - Energi i-Size R129 comes with one-click, colour-coded ISOFIX connectors and top tether installation. In harness booster mode, use both to ensure the car seat stays in place. In highback booster mode, your vehicle’s seat belt is the main installation method, but you may still use the ISOFIX connectors for additional peace of mind
2-in-1 car seat - Get more longevity out of this car seat thanks to the 2 forward-facing modes. From 75 to 105cm (15 months to approx. 4 years), use Energi i-Size R129 as a harness booster. When your child reaches 100cm (approx. 3.5 years), you can store the harness away and transition to highback booster mode until your big kid reaches 150cm (approx. 12 years)
Safety Surround Side Impact Protection - Energi i-Size R129 is equipped with Safety Surround Side Impact Protection, which wraps around your child and provides enhanced head and body protection
No-rethread harness, 15-position headrest, Built-in ventilation, Integrated colour-coded indicators, Plush memory foam seat, Padded armrests, Integrated harness storage, Open-loop belt guides, 5-point harness, Machine-washable covers

Cosatto On The Go, Foldable Car Seat, 15 Months – 12 Years, 76-150cm, Portable ISOFIX Travel Car Seat, Ultra-Compact & Lightweight, Side Impact Protection & Travel Bag (Itchy Feet Sky)

17% Off

Why We Love It

Safe and comfortable travel.
Easy to carry and install.
Stylish designs for every journey.

Main Highlights

GROUP 1/2/3 CAR SEAT: this foldable toddler car seat is suitable from 15 months up to approx. 12 years (76 - 150cm) and is quick to install and easy to carry, so your child travels safely in comfort. On The Go also converts into high-back booster seat mode (100-150cm / approx. 4 to 12 years old)
EASY TO TRAVEL EVERYWHERE: On The Go is built for travelling as it's super easy to foldcomes with a water repellent travel bag. It's IATA hand luggage compatible making it the perfect choice for your family holidays
QUICK & EASY INSTALLATION: With integrated ISOFIX fittings & Top Tether installation for the most secure fit
SAFE WHILST COMFORTABLE - On The Go has had extensive crash and safety testing and is tested in-line with ADAC levels of testing (which goes beyond R129/03). As part of the latest R129 / i-Size standard compliance. The i-Size standard takes testing further with mandatory side impact and roll over testing, all using the latest crash test dummies, to help create even safer car seats.
5 POINT PLUS ANTI ESCAPE HARNESS - Cosatto has partnered with 5 Point Plus and now our car seats include the anti escape system which retails for £30 for free. It's exclusively available on Cosatto car seats which means you can embark on your journey with the peace of mind that your child cannot escape from their car seat. In tests 9 out of 10 children could not wriggle out of their brand new Cosatto Anti-Escape System. That’s a result.
FORWARD FACING - On The Go i-Size car seat is only a forward facing chair
12 HEADREST POSITIONS & PADDED PROTECTORS - On The Go i-Size car seat has deep side wings, a thick padded 10-position head rest and side impact protection with shock absorbing memory foam to keep your precious passenger snug.
BABY SENSORY DESIGN - At Cosatto, we've always believed in the power of pattern to engage your baby and promote happiness. This car seat puts your baby at the heart of visual systems, with bold, bright and carefully placed patterns. Each print comes in multiple products such as prams, highchairs, travel systems footmuffs and changing bags for you to complete the look.
WASHABLE FABRIC - All the removable soft goods. such as the padded seat liner & newborn seat insert, anti-slip chest pads and tummy pad, are washable.
GUARANTEE - All Cosatto baby goods come with a minimum 4 year guarantee in the box.

Enfasafe Spirit iX i-Size R129 High Back Booster car seat with ISOFIX & Top Tether, Forward Facing 76 – 150cm, Approx. 15 Months to 12 Years

Free Shipping

Why We Love It

R129 i-Size approved.
Grows with your child.
Easy double anchorage installation.

Main Highlights

This forward facing car seat is an approved R129 i-Size car seat
Suitable for children of a minimum height of 76cm to maximum height of 150cm (approximately 15 months to 12 years
Easy to install with a double anchorage system of ISOFIX connectors and Top Tether for added protection.
Adjustable headrest for optimum comfort and protection. There is an baby insert cushion to use for smaller children up until a height of 87cm
5-point safety harness for children up to 105cm ≤18kg – removable as your child grows

My Babiie MBCS80 Foldable Toddler to Booster R129 Child Car Seat - ISOFIX with Top Tether, Harness, 76-150cm (Approx. 9-36kg, 15 Months - 12 Years), i-Size, Group 1/2/3, Forward Facing - Black

Why We Love It

Grows with your child’s needs.
Compact design for easy travel.
Hassle-free installation for safety.

Main Highlights

TODDLER & CHILD CAR SEAT: The MBCS80 grows with your child from 76–150cm (from appoximately 9-36kg, 15 months to 12 years, Group 1/2/3), transforming from a secure harness seat to a high-back booster. With adjustable headrest and no-rethread harness, it ensures comfort, safety, and convenience at every stage. i-Size certified and forward facing kids car seat.
FOLD AND GO: The Fold & Go feature allows the booster seat to fold into a compact, portable size for easy carrying. Perfect for travel or storage, it ensures hassle-free convenience while maintaining reliable safety and comfort for your growing child.
HASSLE-FREE INSTALLATION: With a double-fix installation system using ISOFIX and a Top Tether strap, this car seat offers secure, stable attachment to your vehicle.
SAFETY FIRST: The MBCS80 is designed to meet the latest EU R129 safety certification standards. A reinforced shell and additional side impact testing give you peace of mind during every journey.
COMFORT FOR YOUR LITTLE VIP: The 5-point harness system, designed with soft padded covers, keeps your little one both secure and comfortable by protecting the body’s strongest points, ensuring a snug, safe fit throughout every journey from toddler to big kid. An adjustable headrest and extra padding ensure your child's comfort on every journey.
ALSO FEATURES: Simple to remove hand washable cover, breathable fabrics and wide, soft seat, and easy harness storage when switching to booster mode.

Kinderkraft Safety FIX2 I-Size 76-150 cm Car Seat, 15 Months - 12 Years, Booster Child Seat, Isofix, Top Tether, Adjustable Headrest, Group 1-2-3, 5-Point Safety Harness, Modular Insert, Black

Free Shipping

Why We Love It

Suitable for 15 months to 12 years.
Enhanced by SIDE PROTECT SYSTEM.
Breathable material for extra comfort.

Main Highlights

FUNCTIONAL: the car seat is suitable for children from 76 cm to 150 cm tall (approximately 15 months to 12 years or 9-36 kg). It is compliant with the latest R129 i-Size standard, it has successfully passed crash tests
SAFE: ensures easy installation using the ISOFIX system and TOP TETHER strap. The car seat is equipped with the internal five-point safety harness with soft pads and a crotch protector. It has dedicated safety systems: reinforced H-GUARD SYSTEM headrest and wide, high side protection in the form of a SIDE PROTECT SYSTEM. You can adjust the car seat to the seat of the car
COMFORTABLE: there are 12 headrest adjustment positions, and EASY GROW SYSTEM offers simultaneous adjustment of the headrest and the internal safety harness. The car seat has a wide, soft seat with breathable material and additional foam
PRACTICAL: the car seat features special elastic bands to hold the safety harness, making it easier to place the child in it. When you start to fasten your little one with the car seat belt - you can tuck away the internal safety harness without having to remove it from the car seat
MODULAR INSERT: The car seat is equipped with a soft, modular insert for younger children. You can use the insert for a child up to 87 cm tall (the part under the back) or up to 105 cm (headrest). It reduces the space between the car seat and the child, which affects safety during travel

8.7

Excellent

We scanned 861 products

We reviewed these offers relevant to the Toddler Car Seats 15 Months Upwards With Isofix within online retailers such as Amazon, eBay and other local retailers, ensuring we covered all major brands and models. The products we selected come from trusted brands like Maxi-Cosi, Cybex, Joie, Graco, Cosatto, Enfasafe, My Babiie, Kinderkraft, all of which have a reputation for consistently delivering high-quality products that users love and innovative approaches for function & design.

For the best Toddler Car Seats 15 Months Upwards With Isofix in the market, we considered we took a deep dive into 4306 online reviews , focusing on elements like user satisfaction, performance in real-world conditions, and long-term reliability. Our ranking also evaluates each review’s relevancy, authenticity, up-to-dateness and depth so that the comparison is more sound.

We concluded that:

The clear winner of our analysis is Maxi-Cosi Titan S i-Size, Child Car Seat, 15 months-12 years (76-150cm), ISOFIX Car Seat, 5 Recline Positions, 13 Headrest Positions, G-CELL Protection, 5-Point Safety Harness, Tonal Black. We love many things about this product by Maxi-Cosi. What sets it apart from the competition is Grows with your child. , Top EU safety standards, Five comfortable recline positions.
The best value product for most shoppers and where user satisfaction is continuously the highest is CYBEX Silver child car seat Pallas B2 i-Size, ISOFIX, Group 1/2/3 (9-50 kg), From approx. 15 months to 12 years, Incl. cup holder, Blue Moon by Cybex based on online reviews by bloggers, experts and online shoppers.
The biggest bargain at the moment for Toddler Car Seats 15 Months Upwards With Isofix and the best cost-to-value ratio is CYBEX Gold child seat Solution S2 i-Fix, For cars with and without ISOFIX, 100 - 150 cm, From approx. 3 to 12 years (15 - 50 kg), Moon Blackat Cybex with a 29% discount.
Our list of the best Toddler Car Seats 15 Months Upwards With Isofix is updated regularly to reflect new releases and changes in product availability, so be sure to check back often for the latest rankings and discounts.

10 Best Toddler Car Seats 15 Months Upwards With Isofix in The UK

Related Deals You Might Like for Toddler Car Seats 15 Months Upwards With Isofix

Cozy N Safe Logan Group 1/2/3 Car Seat 9-36kg, 9 Months to 12 Years, 5 Point Harness, Forward Facing, Side Impact Protection, Adjustable Headrest, Lightweight, Child, Toddler Car Seat - Black/Grey

Graco Eldura R129 Harness Booster (76-145cm - 15 Months to Approx. 12 Years). Harness mode from 15 months to approx. 4 Yrs (76-105cm), Highback mode from approx. 3.5 to 12 yrs (105-145cm), Midnight

Kinderkraft Car Seat Comfort UP, I-Size Booster Child Seat, with 5 Point Harness, Adjustable Headrest, for Toddlers, Infant, Group 1/2/3, 9-36 Kg, Up to 12 Years, Pink

My Babiie MBCS50 Toddler to Booster R129 Child Car Seat - 5-Point Harness, 76-150cm (Approx. 9-36kg, 15 Months - 12 Years), i-Size, Group 1/2/3, Adjustable, Forward Facing - Black

Graco Extend LX R129 Convertible Car Seat, Rearward Facing for Longer from Birth to Approx. 4 Years (40-105cm). Forward Facing from 15 Months to Approx. 4 Years (76-105cm), Midnight Fashion

Kidoola Adjustable Car Seat for Toddlers & Children - Safety Certified Booster Seat, Padded & Comfortable with 3 Adjustable Age Functions & Straps, Up to 12 Years - ECE R44/04 (Grey & Black)

EnfaSafe Opal i-Size R129 Car Seat & High Back Booster Seat with ISOFIX & Top Tether

Kinderkraft ONETO3 I-Size Child Car Seat, Base with Isofix, Top Tether, Reclining for Toddlers & Infant, Group 1/2/3, Up to 12 Years, Safety Certificate ECE R44/04, 9-36 kg, Blue

My Child Stirling Group 123 ISOFIX Car Seat Charcoal

We scanned 861 products

We concluded that: