You’ve bought the car seat, fitted it correctly (twice, because the first attempt wasn’t quite right), and now your baby is rear-facing and safe. Then someone mentions a backseat mirror and you realise you can’t actually see your child while driving. A window shade would be nice too — the sun hits the back window at 4pm and your toddler screams about it. And the leather seats are already showing marks from the car seat base. Here’s what’s genuinely worth buying, what’s marketing, and what you should skip entirely.
In This Article
- Backseat Mirrors
- Seat Protectors and Kick Mats
- Window Sunshades
- Car Seat Head Supports and Inserts
- Car Seat Travel Bags
- Harness Pads and Buckle Covers
- Car Organisers and Storage
- What to Avoid
- The Essential Accessories Checklist
- Frequently Asked Questions
Backseat Mirrors
Why You Need One
If your baby is rear-facing (which they should be until at least 15 months, and ideally longer), you can’t see them while driving. A backseat mirror attaches to the rear headrest and angles toward the baby, letting you check on them via your rear-view mirror without turning around. It’s the single most useful car seat accessory and one of the few that every parent with a rear-facing seat should own.
What to Look For
- Shatterproof glass or acrylic — essential for safety. In a collision, a regular glass mirror becomes a projectile. Look for mirrors specifically labelled as shatter-resistant or made from acrylic
- Wide-angle or convex lens — a flat mirror shows a narrow view. A slightly convex mirror shows the whole baby and the seat without needing precise positioning
- Secure attachment — double-strap systems with adjustable buckles are more stable than single-strap or suction-cup mounts. The mirror must not move or fall during sudden braking. The Road Vehicles (Construction and Use) Regulations don’t specifically regulate internal accessory mirrors, but anything that could become a projectile in a crash is a safety concern
- Size — larger mirrors (20-30cm diameter) are easier to use at a glance. Tiny mirrors require squinting, which defeats the purpose
Recommended Options
- Brica Baby In-Sight Mirror (about £12-15) — the most popular option. Wide convex surface, dual-strap attachment, pivot adjustment. Available at Amazon UK, Argos, and most baby shops
- Diono Easy View Plus (about £18-22) — includes a remote-activated light for night checks. The light is dim enough not to disturb a sleeping baby but bright enough to confirm they’re breathing. Worth the extra £5 for peace of mind during evening drives
Seat Protectors and Kick Mats
Seat Protectors (Under the Car Seat)
A car seat base — especially ISOFIX — can damage the upholstery underneath. The metal connectors dig in, the base shifts slightly over time, and the weight compresses the cushion. A seat protector sits between the car seat and the vehicle seat.
What works:
- Padded non-slip mats — thick enough to prevent indentation, textured on the bottom to prevent the car seat from sliding. About £10-20 from Amazon UK, Halfords, or Maxi-Cosi
- Material — waterproof or water-resistant backing. Babies leak, and a wet patch under the car seat grows mould if the protector doesn’t block moisture. Our ISOFIX vs seatbelt guide covers installation differences that affect seat protector choice
What to check:
- The protector must not interfere with the car seat installation. Some thick protectors raise the car seat enough to affect the recline angle or the ISOFIX connection. Check your car seat manufacturer’s guidance — some specifically prohibit anything between the car seat and the vehicle seat
Kick Mats (Behind the Front Seats)
Once your child is forward-facing and can reach the back of the front seats, muddy shoes and food-covered hands become a problem. Kick mats hang over the back of the front seat and catch the damage.
- Simple fabric mats (about £8-12) — cover the seatback, easy to remove and wash
- Organiser mats (about £12-20) — include pockets for toys, books, bottles, and tablets. More practical for longer journeys. The pockets keep essential items within reach without them sliding around the car
Window Sunshades
Types
- Static cling shades — thin mesh sheets that stick to the window via static electricity. No suction cups, no adhesive. Easy to apply and remove. About £5-8 for a pack of two. The most practical option for most families
- Roller blinds — attach to the top of the window frame with suction cups and roll down when needed. More adjustable than static cling but the suction cups can fail, especially in heat. About £10-15 each
- Pop-up shades — spring-loaded mesh that folds flat when not in use. Attach with suction cups. Tend to be slightly opaque, which blocks more light but also reduces the child’s view. About £8-12 for a pair
- Fitted shades — custom-cut for specific car models. The best option if you want a permanent, neat solution. About £20-40 per window but look integrated rather than aftermarket
What Actually Matters
UV protection is the primary function. Even on overcast UK days, UV radiation passes through car windows. Rear side windows in most cars block UVB but allow 60-80% of UVA through. A shade with UV rating of UPF 30+ blocks over 96% of UV radiation. For long journeys and summer, this matters more than glare reduction.
Installation Tips
- Static cling shades work best on clean, dry glass. Clean the window with glass cleaner first
- Don’t cover the rear windscreen if it obstructs the driver’s rear view — this can be an MOT failure point
- Test that the shade doesn’t interfere with the electric window mechanism
Car Seat Head Supports and Inserts
What’s Included vs What You Add
Most car seats come with newborn inserts — removable padding that supports the baby’s head and body in the first few months. These are designed and crash-tested with the seat. Never replace them with aftermarket inserts unless the car seat manufacturer specifically approves them.
Aftermarket Head Supports
The market is full of padded head supports, neck pillows, and cushioned inserts sold for car seats. Most of these are not recommended:
- They haven’t been crash-tested with your specific seat
- They can change the position of the harness straps, reducing effectiveness
- They may alter the recline angle of the baby’s head, creating an airway risk
What’s Safe to Use
- The inserts that came with the seat — always safe, always approved
- Manufacturer-branded accessories — if Maxi-Cosi or Joie sell a specific insert for your seat model, it’s been tested with that seat
- Rolled muslin cloths — placed either side of the baby’s head to prevent it lolling sideways. These don’t interfere with the harness and can be removed easily. Our baby car seat guide covers newborn positioning in detail
Car Seat Travel Bags
When You Need One
If you fly with your car seat (see our guide to using a car seat on a plane), a travel bag protects it from damage during baggage handling. Airlines treat car seats as free checked luggage, but they’re thrown onto conveyor belts and loaded into holds without the care you’d hope for.
What to Look For
- Padded or reinforced base — the bottom of the bag takes the most abuse
- Backpack straps — you’re carrying a baby, a bag, and a car seat through an airport. Backpack straps free up a hand. Shoulder straps don’t
- Size — measure your car seat before buying. Many bags are designed for Group 0+/1 seats and won’t fit larger Group 2/3 booster seats
- Identification window — a clear panel for your name tag, visible to baggage handlers
Recommended Options
- Brica Cover Guard (about £20-25) — basic bag with drawstring closure. Functional, no frills
- Car Seat Travel Bag with Backpack Straps (about £25-35) — various brands on Amazon UK. Look for padded bottom and at least 600D polyester fabric
Harness Pads and Buckle Covers
Harness Pads
Soft fabric pads that wrap around the harness straps where they cross the baby’s chest and shoulders. Most car seats include basic pads, but replacements are needed when:
- The originals wear out or get stained beyond cleaning
- The original pads are too thin and the straps mark your baby’s skin
Important: only use pads approved for your car seat model. Third-party pads that are too thick push the harness away from the body, reducing restraint effectiveness. The harness should sit flat against the child with no more than one finger’s width of slack.
Buckle Covers
Plastic or fabric covers for the metal crotch buckle. In summer, the metal buckle heats up in direct sunlight and can burn a child’s skin. A simple fabric cover or a clip-on sun shield prevents this. These cost £3-5 and solve a very specific but genuine problem — metal buckles in a sun-baked car reach temperatures that cause contact burns.
Car Organisers and Storage
Backseat Organisers
Hanging organisers with pockets for toys, snacks, drinks, wipes, and nappies. On long journeys, having essentials within arm’s reach from the back seat prevents the “can you pass me…” cycle that leads to distracted driving.
What to look for:
- Tablet pocket with clear window — if you use a tablet for entertainment, a built-in holder keeps it at eye level without the child holding it (and dropping it, and crying about it)
- Insulated bottle pocket — keeps milk or water at temperature
- Easy-clean fabric — waterproof or wipe-clean material. Children will spill things into every pocket
Boot Organisers
Collapsible storage boxes or bags that keep the boot tidy when you’re carrying pushchairs, changing bags, and the general avalanche of baby equipment. About £10-20 for a multi-compartment organiser from Halfords or Amazon UK.
What to Avoid
Aftermarket Chest Clips
In the US, car seats use a chest clip to hold the harness straps together. UK and European car seats are designed without chest clips — the harness system works differently. Aftermarket chest clips sold online for European seats are not crash-tested and may interfere with the harness release mechanism.
Steering Wheel Trays
Trays that clip to the steering wheel for feeding or play while parked. If the airbag deploys, anything attached to the steering wheel becomes a high-speed projectile. Never attach anything to the steering wheel, even when the car is stationary and switched off — a rear collision can trigger airbag deployment.
Thick Aftermarket Padding Under Harness Straps
As noted above, thick pads between the harness and the child’s body reduce restraint effectiveness. If you wouldn’t add padding under a seatbelt in a crash test, don’t add it under a harness.
Car Seat Covers That Go Over the Harness
Some full-body car seat covers thread through the harness, effectively adding a layer between the child and the straps. These haven’t been crash-tested and could cause the child to be ejected in a collision. The original seat fabric is designed and tested — don’t add layers on top of it.
The Essential Accessories Checklist
Based on genuine usefulness, not marketing:
Must-have (rear-facing):
- Backseat mirror — you need to see your baby
- Seat protector — if you value your upholstery
- Window shade — for the window nearest the car seat
Worth buying (forward-facing):
- Kick mat or organiser — once shoes can reach the front seat
- Buckle cover — for summer heat
Nice to have:
- Travel bag — if you fly with the car seat
- Boot organiser — if your boot is chaos
Skip:
- Aftermarket head supports — use manufacturer-approved inserts only
- Chest clips — not designed for UK car seats
- Steering wheel trays — airbag hazard
Frequently Asked Questions
Are backseat mirrors safe in a car crash? Shatter-resistant mirrors made from acrylic are considered safe by most car seat manufacturers. Glass mirrors are not recommended as they can shatter on impact. Ensure the mirror is securely attached with double-strap fixings — a loose mirror is a projectile risk. Most major car seat brands acknowledge that properly fitted mirrors are acceptable.
Can I put a seat protector under an ISOFIX car seat? Check your car seat manufacturer’s guidance first. Some brands (Maxi-Cosi, Cybex) permit thin, non-slip protectors. Others advise against anything between the car seat and vehicle seat, as it may affect the ISOFIX connection. A protector that’s too thick can raise the seat and alter the installation angle. When in doubt, contact the manufacturer directly.
Are aftermarket car seat inserts safe? Generally no. Aftermarket head supports and body inserts haven’t been crash-tested with your specific car seat. They can alter harness positioning and recline angles, potentially creating safety risks. Only use inserts that came with the seat or are sold by the seat manufacturer for that specific model.
Do I need window sunshades for UK driving? Yes, especially for longer journeys. Car side windows block UVB but allow 60-80% of UVA through. UVA causes skin damage and discomfort for children, even on overcast days. Static cling shades at £5-8 for a pair are the simplest and most effective option for most families.
What car seat accessories are worth buying? A backseat mirror (essential for rear-facing), a seat protector (prevents upholstery damage), and window shades (UV protection) are the three most useful accessories. Kick mats become essential once children are forward-facing. Skip aftermarket inserts, chest clips, and steering wheel trays.