Britax Grow With You Harness Booster Car Seat - Pebble [New Version of the Pioneer]

This item is discontinued.
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Grow With You™ harness-2-booster car seat grows with your child from toddler to big kid. It’s made with premium fabrics and padding for superior comfort and style. Installing the seat is simple using the premium, quick-push LATCH connectors. 2 layers of side impact protection surround the head, neck & torso. Plus, SafeCell Technology in the base acts as a crumple zone to help absorb crash energy.

Quickly adjust the 9-position harness & headrest using just one hand for the proper fit as your child grows. Once they’re ready to use the seat belt, the 5-point harness tucks away, transitioning to a belt-positioning booster. Color-coded guides help you and your child route the seat belt through the right paths. With arm rests, cup holders and harness comfort pads, even big kids enjoy the ride.


  • Harness mode 25lbs - 65 lbs; Booster mode 40 lbs -120 lbs.
  • Stylish, soft-knit fabrics look great in your backseat.
  • SafeCell Technology acts as a crumple zone, helping to absorb crash energy.
  • Industrial strength steel frame reinforces the seat structure to help keep it stabilized.
  • V-shaped tether with staged-release stitches helps slow and reduce forward movement during a crash.
  • 2 Layers of Side Impact Protection: Energy-absorbing shell and foam-lined headrest protect your child’s head, neck, and torso.
  • Premium, quick-push LATCH connectors for simple, secure installation.
  • 9-position, quick-adjust harness & headrest move together using one hand for the proper fit as your child grows.
  • 2-position buckle can be moved outward to accommodate your growing child.
  • 2 recline positions help you find the most comfortable fit for your child and the best fit for your vehicle.
  • 4 cup and snack holders keep drinks, snacks, and toys within reach.
  • Harness comfort pads keep your child’s neck from rubbing against the harness strap.
  • Nap-friendly padding & fabrics for superior comfort and a quiet ride.
  • Color-coded belt guides make it easy for you and your child to route the seat belt through the right paths.
  • Easy-to-remove cover for cleaning without uninstalling the car seat or removing the harness.
  • Flip-forward buckle stays out of the way for easy boarding.
  • Easy-to-clean arm rests help your child ride comfortably.
  • Proudly designed, tested and built in the USA with US and global components for safety and quality.


  • Product Dimensions: 21" L x 19" W x 25" H
  • Car Seat Weight: 23 lbs
  • Child Weight Capacity:
    • Harness mode 25–65 lbs
    • Booster mode 40–120 lbs
  • Child Height Capacity: Up to 63"
Product Reviews
out of 5.0
17 Reviews
Ratings Snapshot
of Reviewers
Vickie W.
Verified Buyer
Noise headrest
May 4, 2024
The car seat is fine but the rest makes a lot of noise. And my grandson has not even used it yet. It is horrible!
Springport, Indiana
Verified Buyer
Great seat & best brand
January 12, 2024
Super easy to install, very comfortable, great price!
Verified Buyer
Didn't realize there was a version that wasn't clicktight =(
June 3, 2023
Ordered it and then realized after receiving it that it wasn't the clicktight version. Didn't realize there were two versions - Disappointed!
Verified Buyer
Nice seat
March 20, 2023
Nice seat. Well built. Comfortable.
Austin, TX
Verified Buyer
Thumbs up
February 7, 2023
This booster seat is much more comfortable for my growing toddler. She is able to reach the cup holders better and have arm rests as well. She gives it a thumbs up.
  • There is styrofoam in the seat so if the headrest is to high the sound gets annoying.
Sacramento, CA
Verified Buyer
Love it!
January 18, 2023
I ordered this seat to use as a spare in my daughter's car for my son. Super easy to strap in. Britax makes an excellent product! I have a larger one in my jeep for him. Albee baby was easy to order online, shipment came quickly and as stated.
Austin, TX
Verified Buyer
Comfortable and easy to install!
September 5, 2022
Comfortable and easy to install!
Happy C.
Verified Buyer
June 30, 2022
High quality product, and was delivered quickly!
Verified Buyer
Get a Clicktight
March 8, 2022
This was our 9th Britax! I didn’t even realize Britax still offered a non-clicktight seat until I went to install this one. It is near impossible to get the seat properly secured. I am going to need to switch this seat, because I cannot properly install this model properly.
  • Looks appealing and like the other Britax booster harness models.
  • Cannot properly install this seat. It moves way too much, even when you?ve gotten the seatbelt as tight as it can be.
Verified Buyer
Love Britax!
January 11, 2022
I bought this seat for my niece. It’s easy to install snd easy to use. Comfortable for the kid. I trust the safety of Britax seats.
Verified Buyer
Love this car seat
December 23, 2021
So I have this car seat plus the britax grow with me CLICKTIGHT. I love the way they both work. I love that my bigger kids can still have the safety and security of a 5 point harness. They can’t lean over to play with each other and slip out of the seatbelt the way they could if just using an adult seatbelt on a booster. That being said one day when they outgrow the harness limits this seat CAN be used as a booster with an adult seatbelt so I don’t need to buy another. The only thing I will add is that I prefer the clicktight. It’s so easy to get in and out of my car or to reinstall it in a different row. The additional price for that upgrade is worth it. Oh also my kids love the double cup/snack holders. I do too Bc they still can’t reach the door upholders when harnessed so this is helpful on road trips. And they don’t complain they’re uncomfortable on road trips (not til the end of the day). They can recline just enough that when they fall asleep on trips their heads stay back and aren’t flopping around. My kids are now 5 and 7 yo. We’ve had these car seats for probably 2 years now. No complaints.
  • Safety
Best Uses
  • Bigger kids
Verified Buyer
Isn’t love…
October 22, 2021
I prefer the click tight much better, worth the money difference.
Tustin, CA
Verified Buyer
Great seat!
November 27, 2020
My 5 year old peanut loves this seat. It’s easy to set up and click in. The only annoying thing is the styrofoam behind the head rubs and makes an awful noise.
Not sure how to fix that.
Otherwise, it does its job and we feel safe with my child in it.
Apex, NC
Verified Buyer
Great Harness Booster
November 27, 2020
Bought this for my 4 year old so I could move the baby to his convertible car seat. He adores this seat. It’s comfortable, he thinks he’s big stuff with two cup holders and space for a snack or toy. I love the security of the five point harness. He’s on the average, or maybe even slightly small side, so having a five point harness that he can use for a few years is very important to me. It’s easy to install and easy to move from one vehicle to another, if needed.
Karen B.
Verified Buyer
September 30, 2020
My daughter in law read the safety ratings and that is why we chose this seat for our grandson. It seems well made and has a good crash rating. Not a 5 point harness but easy to install and comfortable head rest adjustments
Verified Buyer
Oldest loves it.
September 10, 2020
I love the cup holders and so does my oldest toddler. Like all of Britax products, it is easy to install. I should say no complicated instructions. No complaints from our household about it!
Verified Buyer
Comfortable, convenient, easy install
July 23, 2020
We love this for our 4 year old. She’s able to grab books and toys from a box beside her seat. Install was a breeze with the latch harnesses.
  • Size, install
Customer Q&A