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CERTAIN CONTENT THAT APPEARS ON THIS SITE COMES FROM AMAZON. THIS CONTENT IS PROVIDED ‘AS IS’ AND IS SUBJECT TO CHANGE OR REMOVAL AT ANY TIME.
Price on Amazon.com as of 2026-11-02 21:50 UTC, and subject to change.
A harness-to-booster seat with 2 modes: forward-facing harness 30 to 65 lb, 35 to 49 in; belt-positioning booster 40 to 120 lb, 44 to 63 in.
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CERTAIN CONTENT THAT APPEARS ON THIS SITE COMES FROM AMAZON. THIS CONTENT IS PROVIDED ‘AS IS’ AND IS SUBJECT TO CHANGE OR REMOVAL AT ANY TIME.
The Britax Grow With You is a forward-facing combination seat without ClickTight. Its harness fits children at least 2 years old, 30 to 65 lb and 35 to 49 in, and its high-back booster fits 40 to 120 lb and 44 to 63 in. It installs with LATCH or a locked vehicle belt and expires after 9 years.
It suits a family that wants the Grow With You harness and booster ranges and is comfortable locking a vehicle belt or using LATCH. The trade-off against the Grow With You ClickTight is installation: there is no belt clamp, so a belt install depends on locking the belt the way the vehicle manual describes. Britax lists this seat at 23 lb against 25 lb for the ClickTight version, and this manual allows lower anchors up to 45 lb rather than 40 lb.
A research summary of Britax’s published specifications and manual, read . Not a hands-on test or a crash-safety rating.
This seat covers 2 stages, and a child has to meet every limit of the stage they are in. Britax gives it a 9-year life from the date of manufacture, so check the date label before using a hand-me-down.
| Mode | Child weight | Child height | Minimum age | Conditions |
|---|---|---|---|---|
| Forward-facing harness | 30 to 65 lb | 35 to 49 in | 2 years | At least 2 years (manual); lower anchor installation limited to 45 lb (manual); upright position required above 40 lb |
| Belt-positioning booster | 40 to 120 lb | 44 to 63 in | Not published | Upright position only (manual) |
A child must meet every limit for the mode they use. The labels on your seat and its manual are the final word.
Every install is a fit between one seat and one vehicle. Read both manuals, and use a free inspection station if anything is unclear.
Britax does not publish a width for this seat, so measure your back seat and compare it with the seat in a store before buying. It weighs 23 lb, which matters if you will move it between cars or carry it through an airport.
Mod Black.
This model has no ClickTight. For a lap-shoulder belt installation you pull the seat cover forward, route the belt along the green belt path, buckle, then push the seat into the vehicle seat while removing slack from the lap and shoulder parts. The manual says to make sure the belt is locked as your vehicle owner's manual directs. A lap belt installation uses the same path and also needs a locked belt. Lower anchor attachments are for children up to 45 lb. The seat is installed when it moves no more than 1 in. at the belt path, and Britax recommends the tether every time.
One adjuster raises the harness and head restraint together. The straps go in the closest position at or above the shoulders, and the top of the ears must be below the top of the head restraint. The seat may be upright or reclined for children 30 to 40 lb, and must be upright from 40 to 65 lb. Up to 3 in. of the base may overhang the front edge of the vehicle seat in harness mode; in booster mode the base must sit fully on the vehicle seat. If the vehicle head restraint blocks the seat's head restraint, do not force it.
In booster mode the vehicle lap and shoulder belt holds the child, the seat stays upright, and the harness can be stored rather than removed. Lower anchors can hold the seat in place in booster mode if they do not interfere with belt fit, and the seat must stay secured even when it is empty. For cleaning, follow the cover's care label and do not bleach or iron. Sponge clean the shell and harness with warm water and mild soap, and do not machine wash the harness. Rinse the buckle in warm water without soap. Stop using the seat after 9 years or a moderate or severe crash.
No campaign in the current NHTSA child-restraint data names this model family, and I have not run a separate review for it. Check your seat’s model number and date of manufacture before use.
Harness mode is for children at least 2 years old, 30 to 65 lb and 35 to 49 in. Booster mode is for 40 to 120 lb and 44 to 63 in.
The manual says not to install with the lower anchor attachments for a child over 45 lb. Above that, install with the vehicle belt, locked as your vehicle owner's manual directs.
Yes. Both the lap-shoulder and lap belt installations tell you to make sure the vehicle belt is locked as directed by your vehicle owner's manual.
It is certified for aircraft in harness mode, installed with the aircraft lap belt and without the tether. It is not certified in booster mode, because aircraft have no shoulder belts.
Britax lists it at 23 lb for the car seat only, with product dimensions of 21" x 19" x 25" and a seat area 15" deep and 12" wide.
Britax Grow With You Harness-2-Booster product page (opens in a new tab)
The ClickTight version lists the same harness and booster ranges, adds ClickTight installation, and Britax lists it at 25 lb.
Britax Grow With You ClickTight Harness-2-Booster product page (opens in a new tab)
Answers refer to the model and manual version on this page. Check the instructions supplied with your seat.
| Model | Top child weight | Seat weight | Width | Usable life |
|---|---|---|---|---|
| Grow With You Harness-2-Booster Car Seat (this seat) | 120 lb | 23 lb | — | 9 years |
| Grow With You ClickTight Harness-2-Booster Car Seat | 120 lb | 25 lb | — | 9 years |
| Highpoint 2-Stage Belt-Positioning Booster | 120 lb | 12 lb | — | 10 years |
| Skyline 2-Stage Belt-Positioning Booster | 120 lb | 11 lb | — | 10 years |
| UpNGo Backless Booster Seat | 120 lb | 3.1 lb | 17.1 in | 10 years |
| UpNGo Click Backless Booster Seat | 120 lb | 4.5 lb | 17.1 in | 10 years |
Other harness-to-booster seats whose published weight and height limits overlap the Grow With You Harness-2-Booster Car Seat.
| Mode | Weight | Height |
|---|---|---|
| Forward-facing harnessfrom 2 years | 30–65 lb | 35–49 in |
| Belt-positioning booster | 40–120 lb | 44–63 in |
$359.99Cool Flow Gray · Amazon price as of 2026-11-02 21:50 UTC, subject to change
| Mode | Weight | Height |
|---|---|---|
| Forward-facing harness | 26.5–65 lb | Up to 49 in |
| High-back boosterfrom 4 years | 40–100 lb | 43–57 in |
| Backless boosterfrom 4 years | 40–120 lb | 43–57 in |
$189.99Price on gracobaby.com as of 2026-10-07 05:48 UTC, subject to change
| Mode | Weight | Height |
|---|---|---|
| Forward-facing harness | 26.5–65 lb | Up to 49 in |
| High-back boosterfrom 4 years | 40–100 lb | 43–57 in |
| Backless boosterfrom 4 years | 40–120 lb | 43–57 in |
$219.99Hex 2.0 · Amazon price as of 2026-11-02 21:52 UTC, subject to change
| Mode | Weight | Height |
|---|---|---|
| Forward-facing harnessfrom 2 years | 30–65 lb | 34–49 in |
| Belt-positioning boosterfrom 4 years | 40–110 lb | 43–57 in |
$680.00Price on nunababy.com as of 2026-10-07 05:48 UTC, subject to change
