Britax Willow Brook S+ Review

For parents who prioritize installation safety and want Britax's car seat technology in a bundle, yes. The 18% bundle savings ($110 off vs buying separately) is genuine — the Willow S is bundle-exclusive and has no standalone retail price. The Alpine base's ClickTight installation and ReboundReduce anti-rebound bar are safety features typically found on $300+ standalone seats. At $400–500 street price, it's competitive with Chicco Bravo Trio ($400–450) while offering meaningfully better car seat safety technology. The main trade-off: the stroller is forward-facing only and lacks the modularity of Graco's Modes line.

The stroller gate-checks free on all major US airlines including Delta, American, United, Southwest, and JetBlue. At 23 lbs folded, it's within every major carrier's gate check weight limit. More importantly, the Willow S infant car seat is FAA-approved as a child restraint system — you can use it in a purchased window seat on the aircraft, which is a meaningful safety advantage for long-haul flights with infants. Detach the Willow S before gate-checking the stroller frame to protect the seat from baggage handling. Pick up the stroller at the jet bridge on most domestic flights.

The Brook+ stroller frame natively accepts the Willow S infant car seat via the Click & Go system. Britax's B-Safe series also connects to the Brook+ frame without adapters. For other brands (Chicco KeyFit, Nuna PIPA, Maxi-Cosi Mico, Graco SnugRide), third-party Click & Go adapters are available but compatibility varies by stroller generation. Importantly, the Willow S is the only Britax seat currently available in this configuration — Britax explicitly states the Willow is only available in the travel system, not as a standalone purchase.

ClickTight is Britax's patented car seat installation system that routes the vehicle seatbelt through a dedicated channel inside the base, then locks it with a mechanism that physically prevents common installation errors. A green indicator confirms correct installation. Studies by NHTSA and various CPSTs have found that up to 46% of car seats are installed incorrectly. ClickTight eliminates the most common errors — over-routed belts, wrong belt path, loose installation — making it particularly valuable for caregivers who install and remove the seat frequently or use multiple vehicles.

The Willow S has a 30 lb weight limit and a 32-inch height limit. Based on CDC growth charts (50th percentile), most babies reach 32 inches around 18–20 months, well before reaching 30 lbs (which typically happens around 28–30 months). In practice, the height limit is almost always the forcing factor — plan for the transition to a convertible car seat around 13–18 months for average-sized babies. Smaller babies may get closer to 20 months. The 1-inch head clearance rule (top of head within 1 inch of seat shell) often triggers transition before either official limit is reached.

The Willow Brook S+ is the current mid-tier version at $539.99 MSRP (commonly $400–500 street price) featuring the Alpine base with ReboundReduce anti-rebound technology. The original Willow Brook used the older Aspen base at $469.99 without the anti-rebound bar. Britax has also discontinued the original Willow Grove and replaced it with the Willow Grove SC ($629.99) as the premium version. The S+ is the recommended current purchase for most families — the anti-rebound bar upgrade from the original justifies the price difference.