Vehicle Headrest Pushing the Car Seat Forward? What to Check and Do
You install a forward-facing car seat, tighten everything, and notice a gap between the car seat's back and the vehicle seat back, because the vehicle headrest is pushing the top of the car seat forward. Or a rear-facing seat won't recline properly because it hits the headrest of the front seat. Headrest interference is one of the most common fit problems in newer vehicles, which tend to have large, fixed or angled head restraints. Here's how to work out whether it's a problem and what the manuals usually let you do about it.
Quick answer
- Many car seat manuals require the car seat to sit flush against the vehicle seat back when forward-facing, or don't allow a gap caused by the headrest. Check yours.
- Your vehicle owner's manual says whether a headrest can be adjusted, flipped or removed in each seating position, and whether it must be put back for an adult passenger.
- Your car seat manual says what to do about interference. Some say to remove the headrest if the vehicle allows it, some prohibit it, and some say to choose a different position.
- Never use the headrest as a brace for the car seat unless both manuals allow it.
- If the two manuals conflict or you can't get a correct fit, try a different seating position or have a certified CPST look at it.
Why headrests interfere
Vehicle head restraints are designed to protect adult heads and necks in rear impacts. Many sit well forward of the seat back, are angled, or are tall and fixed in place. A forward-facing car seat with a tall back or a high harness position can hit the headrest before the car seat's back reaches the vehicle seat back. That leaves a gap behind the car seat.
The same thing can happen in reverse. A tall rear-facing seat can make contact with the front seat's headrest or seat back. Whether that contact is allowed is set by the car seat manual, and sometimes by the vehicle manual too.
Why a gap behind a forward-facing seat matters
A forward-facing seat is designed to sit against the vehicle seat back so the vehicle seat supports the car seat's shell. When the headrest pushes the top forward, the car seat may sit at the wrong angle, the tether may not pull correctly, and the install might feel tight when it isn't. Most manuals address this directly, which tells you manufacturers consider it important. Some allow a small gap; many don't. Your manual decides.
Don't stuff towels, pool noodles or anything else behind the car seat to "fill the gap." Rolled towels or pool noodles are sometimes allowed by car seat manuals to adjust rear-facing recline angle, which is a different situation. For forward-facing, follow the manual's instruction for headrest interference.
Your options, in the order to try them
- Read both manuals' headrest sections. In the vehicle manual, look under head restraints and child restraints. In the car seat manual, look for "vehicle head restraint" or "headrest."
- Adjust the headrest. Raising it to its highest position is often enough to clear the car seat's back. Some vehicles let you tilt or fold a headrest. Do this only as the vehicle manual describes.
- Remove the headrest if both manuals allow it. Many vehicles allow rear headrests to be removed (press a release on the post and lift). Keep it somewhere safe and reinstall it before an adult or a child in a booster uses that seat.
- Try a different seating position. Outboard and center positions often have different headrest shapes. Some center seats have a lower or removable headrest.
- Consider whether this seat fits this vehicle. If none of these work, the combination may not be compatible. A different seat may fit better.
Headrests and booster seats are a different situation
With boosters, the rule often flips. A booster needs the vehicle headrest behind the child's head for rear-impact protection, especially backless boosters. Many booster manuals tell you to adjust the vehicle headrest, and some to remove it if it pushes a high-back booster forward. Our existing article on booster seats and vehicle headrests covers this.
That's why remembering what you did with the headrest matters. If you take it out for a harnessed seat, and later that seating position is used with a booster or by an adult, put it back.
Rear-facing seats and the front seat
For rear-facing seats, the question is usually whether the car seat may touch or brace against the front vehicle seat back. Manuals differ:
| Common manual stance | What it means |
|---|---|
| Light contact allowed | The car seat can touch the front seat back, but not be wedged or pushed by it |
| Bracing allowed | The front seat may press firmly against the car seat (less common) |
| No contact allowed | There must be a gap between the car seat and the front seat |
| Vehicle manual restrictions | Some vehicles restrict contact with the front seat back, for example because of seat sensors |
Rear-facing seats and the front headrest can also clash, especially with large convertibles in compact cars. If the front passenger has to move forward a lot, look at the overall fit rather than forcing it. Our car seat fit checklist helps you measure before you buy.
Shopping with headrest clearance in mind
If headrest interference is a known problem in your vehicle, it's worth comparing seats on these points:
Shell back shape
Some seats have a curved or recessed upper back that clears forward-angled headrests better.
Overall height
A shorter shell (with the headrest at a lower setting) may clear better, but check the harness height range for your child.
Manual policy
Download the manual before buying and read what it says about gaps and headrest removal.
Vehicle compatibility
Some manufacturers list vehicle fit information or answer fit questions through customer service.
Browse compact convertible car seats on Amazon
If you're looking at combination or harness-to-booster seats, the same headrest question applies in both modes. Browse harness-to-booster seats and check each manual's headrest instructions for harness mode and booster mode separately.
If interference is with a rear-facing seat and the front seat, an infant seat or a compact convertible may sit more upright and need less room. Browse compact infant car seats, and check each manual's rules on contact with the front seat.
Headrest fit checklist
- Car seat back sits flush with the vehicle seat back, or within whatever gap your manual allows
- Headrest adjusted or removed only as both manuals allow
- Removed headrest stored safely and labelled for its seating position
- Top tether routed correctly over or around the headrest, per both manuals (some vehicles specify routing)
- Install still moves less than about an inch at the belt path after any headrest change
- Headrest replaced before an adult or a child in a booster uses that seat
Some vehicles specify whether the top tether goes over the headrest or between the headrest posts. Raising or removing the headrest can change which is correct. Check the tether section of the vehicle manual, and see our top tether guide.
FAQ
Is it OK if there's a small gap behind my forward-facing car seat?
It depends on your car seat manual. Some allow a small gap and many don't. If the gap comes from the vehicle headrest, follow your manual's instructions for headrest interference.
Can I remove my car's rear headrest?
Many vehicles allow it in certain positions; some don't, and some headrests are fixed. Your vehicle owner's manual says. Reinstall it before anyone not in a harnessed car seat sits there.
Can a rear-facing car seat touch the front seat?
Some manuals allow light contact, a few allow bracing, and some require a gap. Check your car seat manual and your vehicle manual.
What if the two manuals disagree?
Don't use that setup. Try another seating position, call the manufacturers' customer service lines, or ask a certified Child Passenger Safety Technician to look at it in person.
The bottom line
Headrest interference is common and usually solvable: adjust the headrest, remove it if both manuals allow, or switch seating positions. What you shouldn't do is ignore a gap or pad it with something improvised. If you can't get it right, a certified Child Passenger Safety Technician can usually spot the fix in minutes. NHTSA's car seat inspection locator lists free checks. See our guide to finding a CPST.