Britax Willow Brook S+ Baby Travel System: An Honest Travel Review

The Britax Willow Brook S+ baby travel system is a full-size travel system, and that is the first thing to understand about it. It pairs the Willow S infant car seat with the Brook+ modular stroller and the Alpine base: one purchase that covers the car, the pavement, and the destination. The whole system weighs 26 lb, the stroller with its seat weighs 23 lb, and the car seat on its own weighs 9.2 lb. So the system is genuinely useful for driving holidays and stays at the destination — and it is not a cabin item, and it is not light to carry through an airport.

That split is the whole point of this article. The car seat is light and travels well. The stroller is heavy and travels as checked or gate-checked luggage. Buy the system for the car and the destination, not for the flight itself.

Specs at a glance

Spec	Willow Brook S+
Included	Willow S infant car seat, Alpine base, Brook+ modular stroller
Total system weight	26 lb
Stroller with seat	23 lb
Stroller frame alone	15 lb
Car seat alone	9.2 lb
Car seat range	4–30 lb, up to 32 inches, rear-facing only
Stroller capacity	From birth up to 50 lb, reversible toddler seat
Folded size	About 28 x 20 x 12 inches
Car seat installation	ClickTight on the Alpine base
Car seat fabric	SafeWash, machine washable and dryable

Price is not listed here on purpose: prices and versions change, so check the current price before buying.

The Willow S car seat

The car seat is the strongest part of the system for travel. At 9.2 lb on its own, the Willow S is light to carry through an airport in one hand, and it is rear-facing only, for babies from 4 to 30 lb and up to 32 inches tall. That is the stage when a baby still rides in an infant carrier everywhere, so the seat does the same job in the car, in a taxi, and clicked onto the stroller frame.

The Alpine base stays in the car. It installs with ClickTight, which is Britax’s way of making a firm base installation without guessing whether the belt is tight enough. The SafeWash fabric on the seat is machine washable and dryable, which matters after a long trip: a car seat that has survived a flight, a car, and a week of use needs a wash, not a wipe.

The Brook+ stroller

The Brook+ is a modular stroller with a reversible toddler seat, for children from birth up to 50 lb. The seat faces you or faces out, and the car seat clicks onto the same frame, so a sleeping baby moves from car to stroller without waking. That is the convenience a travel system is really selling: one frame, two ways to carry the baby, and no separate stroller to buy for the first year.

The honest part is the weight. The stroller with its seat weighs 23 lb, and the frame alone weighs 15 lb. Folded, it is about 28 x 20 x 12 inches. That is a full-size fold, not a cabin fold. It is a stroller for pavements, shops, and parks at the destination — not a stroller you carry onto a plane.

What is good

First, the system is complete. Car seat, base, and stroller arrive together and work together, so there is nothing extra to buy before the first trip. The car seat clicks onto the stroller frame, and the base installs with ClickTight, so the pieces fit without adapters or guesswork.

Second, the car seat is genuinely light. At 9.2 lb it is easy to carry, and the 4–30 lb range covers the whole infant-carrier stage. A light car seat is the part of a travel system you will actually carry through an airport, and this one is light enough for that job.

Third, the stroller lasts. A reversible seat from birth up to 50 lb means the same stroller serves a newborn and a toddler, and the SafeWash fabric means the seat can be washed properly after trips. A system that only works for six months is a poor buy; this one is built for years of use.

What is not good

The weight is the main problem for travel. At 26 lb for the whole system and 23 lb for the stroller with its seat, this is a heavy thing to move through an airport with a baby on your other arm. If you buy it expecting a light travel stroller, you bought the wrong system.

The fold is the second problem. At about 28 x 20 x 12 inches folded, the stroller will not fit in an overhead bin, and it will not fit under a seat. It is a gate-check item at best, and a checked item on many trips. A gate-checked stroller is still useful at the airport — but it is not a cabin item, and the flight does not get easier because the box says travel system.

The third thing to know is the car seat’s limit. The Willow S suits babies up to 30 lb and 32 inches, rear-facing only. A baby near that limit is out of the infant carrier, so the car seat part of the system has a shorter life than the stroller part. Check your baby’s size before buying for a trip that is still months away.

Travel use: flight, car, and hotel

On a flight, the car seat is the part that travels with you, and the stroller travels as luggage. Carry the Willow S through the airport — at 9.2 lb it is manageable — and gate-check the stroller at the aircraft door, so it is waiting when you land. If you are flying with a baby for the first time, confirm with your airline before you travel what counts as baby equipment and what counts against your baggage allowance, so the plan works at the gate and not just on paper. Our first flight with a baby checklist covers the gate routine step by step.

By car, the system finally makes full sense. The Alpine base stays installed, the car seat clicks in and out, and the stroller folds into the boot. The 23 lb stroller is no problem when the car carries it, and the reversible seat means the baby can face you in a new place or face out when they want to look around.

At the destination, the stroller is the everyday tool and the car seat is the car tool. If you are staying in a hotel with a baby, the stroller handles pavements, lobbies, and restaurants, and the car seat stays with the car or the taxi. The two parts do different jobs on the same trip, and that is why they are sold together.

One more check before you fly with any car seat: our travel car seats guide covers which seats are approved for use on a plane and which are car-only. The Willow S is an infant carrier for the car and the stroller; confirm with your airline whether it can be used in a plane seat, or whether it travels as baggage, before you count on it in the cabin.

Who should buy it — and who should not

• Buy it: you travel mostly by car, you want one system for the car and the destination, and you want a light infant car seat with a stroller that lasts from birth to 50 lb.
• Buy it: you want the car seat to click onto the stroller without adapters, and you want a proper base installation with ClickTight in the car.
• Skip it: you fly often and want a light cabin stroller — this system is 26 lb and folds too large for the cabin.
• Skip it: your baby is already near 30 lb or 32 inches — the infant carrier is nearly outgrown, even though the stroller still has years left.

FAQs

How much does the Britax Willow Brook S+ weigh?

The whole system weighs 26 lb. The stroller with its seat weighs 23 lb, the frame alone weighs 15 lb, and the Willow S car seat on its own weighs 9.2 lb. The 26 lb figure is the total system weight, not the stroller alone.

Can the Britax Willow Brook S+ go in the cabin?

No. Folded at about 28 x 20 x 12 inches and 23 lb for the stroller with its seat, it is far too large and heavy for an overhead bin. Gate-check it at the aircraft door instead.

What age and size is the car seat for?

The Willow S is rear-facing only, for babies from 4 to 30 lb and up to 32 inches tall. The stroller suits children from birth up to 50 lb.

What is included in the system?

The Willow S infant car seat, the Alpine base, and the Brook+ modular stroller. The car seat clicks onto the stroller frame, and the base installs in the car with ClickTight.

Is the car seat fabric washable?

Yes. The SafeWash fabric on the infant car seat is machine washable and dryable.

Should I check the price before buying?

Yes. Prices and versions change, so check the current price before buying, and confirm you are looking at the S+ system — the Willow S car seat, Alpine base, and Brook+ stroller together — not the stroller alone.