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LATCH lower anchors make installation easier, but they have limits. Under federal labeling requirements, lower anchors are generally rated for a combined weight of child and car seat up to 65 pounds, and car seat manufacturers state on labels and in manuals when to stop using them for each seat.
How the limit works
The limit applies to the combined weight of the child plus the car seat. Seat labels usually state the child weight limit for lower anchor use, so you don't have to calculate it.
Where to find it
Check your seat's label and manual, and your vehicle manual.
Switching to seat belt installation
When your child reaches the limit, install with the vehicle seat belt instead. Seat belt installs are equally safe when done correctly. See LATCH vs seat belt.
Keep using the top tether
For forward-facing seats, keep using the top tether. See top tether explained.
Boosters and LATCH
Some boosters have LATCH connectors to keep them in place; the seat belt restrains the child. Follow the manual.
Why lower anchors have limits
Lower anchors are strong metal bars built into the vehicle, but they're designed and tested for a certain load. As children and car seats get heavier, the forces in a crash increase. The federal labeling rules require car seat makers to tell parents when to stop using lower anchors based on the combined weight of child and seat, so installations stay within what the anchors are designed to handle. After that, the vehicle seat belt, designed for adult occupants, takes over.
Reading the label on your seat
Look for a label on the seat that states the maximum child weight for using lower anchors, often expressed separately for rear-facing and forward-facing modes. Heavier seats have lower child weight limits for lower anchors because the seat itself weighs more. Your vehicle manual may also state limits for lower anchors in your vehicle. Follow whichever is more restrictive.
How to switch to a seat belt installation
- Remove the lower anchor connectors and store them as the manual directs (many seats have storage clips).
- Route the vehicle seat belt through the correct belt path for the mode you're using.
- Buckle the belt and lock it, using the vehicle's locking retractor or the seat's lock-off, as the manuals direct.
- Press the seat down and back while removing slack from the belt.
- Check for less than an inch of movement side to side and front to back at the belt path.
- For forward-facing seats, attach and tighten the top tether.
See how to install a car seat.
Middle seats and borrowed anchors
Many vehicles don't have dedicated lower anchors in the middle seat. Using the inner anchors from the outboard positions ("borrowing") is only allowed if both your vehicle and car seat manuals permit it and the anchor spacing matches. Otherwise, use the seat belt in the middle position.
A common misconception
Some parents think LATCH is safer than seat belt installation. Both are safe when used correctly. The best installation is the one you can do correctly every time, within the limits of your seat and vehicle.
Keeping track as your child grows
Children grow quickly. Note your child's weight at checkups and compare with your seat's lower anchor limit for the mode you're using. Many parents set a reminder to switch to seat belt installation when their child approaches the limit.
Boosters with LATCH connectors
Some boosters have lower anchor connectors. These keep the booster in place when unoccupied, so it doesn't fly around in a crash, and add stability. The child is restrained by the vehicle seat belt, and booster manuals explain how the connectors are used. Weight limits for these connectors differ because the belt restrains the child.
Seat belt installation tips
Seat belt installs sometimes feel harder than LATCH. Put weight into the seat while removing slack, use the seat's lock-off if it has one, and check that the belt is locked. Practice at home and ask a CPST for tips. Seat belt installation is just as safe when it's tight and correct.
Our bottom line
Check your seat's label for the lower anchor limit, switch to a seat belt installation when your child reaches it, keep using the top tether for forward-facing seats, and have a CPST confirm your installation.
Why the rule isn't the same for every seat
Car seats weigh different amounts, so the child weight at which the combined total reaches the limit differs from seat to seat. That's why seat labels, not a single universal child weight, tell you when to stop using lower anchors.
Vehicles with LATCH in more positions
Some newer vehicles have lower anchors in three or more positions. Limits still apply to each anchor set, and the same rules about switching to seat belt installation apply.
Common questions at inspections
CPSTs often see seats still installed with lower anchors past their limits. A quick label check prevents this.
Related
1. Convertible car seat
$$Best for: All families
Check your seat's lower anchor limit.
What we like
- Clear limits
Watch out for
- Read manual
2. Booster with LATCH connectors
$Best for: Keeping boosters in place
LATCH-equipped boosters stay put when unoccupied.
What we like
- Stays put
Watch out for
- Belt restrains child
Frequently asked questions
What is the LATCH weight limit?
Generally, lower anchors are rated for a combined child plus seat weight up to 65 pounds; check your seat's label for the child weight limit.
Is seat belt installation less safe?
No, when done correctly.
Should I use LATCH and seat belt together?
Only if the manual allows; most don't.
Do I still use the top tether?
Yes, for forward-facing seats.
Where do I find my seat's limit?
On the label and in the manual.
Does the limit include the child's clothing?
It's based on the child's weight; the seat label's child weight limit is the practical number to follow.
Do all vehicles have the same lower anchor limit?
Car seat labels usually cover it, but check your vehicle manual too, and follow whichever is more restrictive.
Can I install a booster with LATCH?
Some boosters use LATCH to stay in place; the seat belt restrains the child. Follow the booster manual.