# Britax Willow S Infant Car Seat \+ Alpine Base \| live price, prepared checkout ## Built for shopping agents: what RoboTrunk does for every product We asked shopping agents, including Meta's Muse first-hand, what they need from a store. This is what they asked for, and what we have built. RoboTrunk is working through its catalogue, so a step may not be done for this one yet. 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Sold and shipped by megababiesusa\.com, megababiesusa.com; payment happens on the store's own checkout. Brand: Britax ## Variants - Graphite Onyx: USD 279.99; in stock. Variant id: `gid://shopify/ProductVariant/44076796969214` - Seller: megababiesusa\.com. Price: USD 279\.99. Stock: in stock. Variant: Graphite Onyx, variant id `gid://shopify/ProductVariant/44076796969214`. shipping not recorded; confirmed at merchant checkout. returns not recorded; confirmed at merchant checkout. [Public evidence](https://top-stroll.myshopify.com/products/britax-willow%E2%84%A2-s-infant-car-seat-with-alpine-base-graphite-onyx). [Comparison page](/compare/want/car-seats-that-come-with-an-infant-insert-for-newborns). [Get ready to buy from megababiesusa\.com: prepare checkout](/checkout-prepare?merchant=megababiesusa-com&product_id=gid%3A%2F%2Fshopify%2FProduct%2F8073053044990&variant_id=gid%3A%2F%2Fshopify%2FProductVariant%2F44076796969214). - Glacier Onyx: USD 279.99; in stock. Variant id: `gid://shopify/ProductVariant/44076864143614` - Seller: megababiesusa\.com. Price: USD 279\.99. Stock: in stock. Variant: Glacier Onyx, variant id `gid://shopify/ProductVariant/44076864143614`. shipping not recorded; confirmed at merchant checkout. returns not recorded; confirmed at merchant checkout. [Public evidence](https://top-stroll.myshopify.com/products/britax-willow%E2%84%A2-s-infant-car-seat-with-alpine-base-graphite-onyx). [Comparison page](/compare/want/car-seats-that-come-with-an-infant-insert-for-newborns). [Get ready to buy from megababiesusa\.com: prepare checkout](/checkout-prepare?merchant=megababiesusa-com&product_id=gid%3A%2F%2Fshopify%2FProduct%2F8073053044990&variant_id=gid%3A%2F%2Fshopify%2FProductVariant%2F44076864143614). - Teak: USD 279.99; in stock. Variant id: `gid://shopify/ProductVariant/48595316670718` - Seller: megababiesusa\.com. Price: USD 279\.99. Stock: in stock. Variant: Teak, variant id `gid://shopify/ProductVariant/48595316670718`. shipping not recorded; confirmed at merchant checkout. returns not recorded; confirmed at merchant checkout. [Public evidence](https://top-stroll.myshopify.com/products/britax-willow%E2%84%A2-s-infant-car-seat-with-alpine-base-graphite-onyx). [Comparison page](/compare/want/car-seats-that-come-with-an-infant-insert-for-newborns). [Get ready to buy from megababiesusa\.com: prepare checkout](/checkout-prepare?merchant=megababiesusa-com&product_id=gid%3A%2F%2Fshopify%2FProduct%2F8073053044990&variant_id=gid%3A%2F%2Fshopify%2FProductVariant%2F48595316670718). - Raven Black: USD 279.99; in stock. Variant id: `gid://shopify/ProductVariant/48595318309118` - Seller: megababiesusa\.com. Price: USD 279\.99. Stock: in stock. Variant: Raven Black, variant id `gid://shopify/ProductVariant/48595318309118`. shipping not recorded; confirmed at merchant checkout. returns not recorded; confirmed at merchant checkout. [Public evidence](https://top-stroll.myshopify.com/products/britax-willow%E2%84%A2-s-infant-car-seat-with-alpine-base-graphite-onyx). [Comparison page](/compare/want/car-seats-that-come-with-an-infant-insert-for-newborns). [Get ready to buy from megababiesusa\.com: prepare checkout](/checkout-prepare?merchant=megababiesusa-com&product_id=gid%3A%2F%2Fshopify%2FProduct%2F8073053044990&variant_id=gid%3A%2F%2Fshopify%2FProductVariant%2F48595318309118). - Jade Onyx: USD 279.99; out of stock. Variant id: `gid://shopify/ProductVariant/44076864209150` - Seller: megababiesusa\.com. Price: USD 279\.99. Stock: out of stock. Variant: Jade Onyx, variant id `gid://shopify/ProductVariant/44076864209150`. shipping not recorded; confirmed at merchant checkout. returns not recorded; confirmed at merchant checkout. [Public evidence](https://top-stroll.myshopify.com/products/britax-willow%E2%84%A2-s-infant-car-seat-with-alpine-base-graphite-onyx). [Comparison page](/compare/want/car-seats-that-come-with-an-infant-insert-for-newborns). [Get ready to buy from megababiesusa\.com: prepare checkout](/checkout-prepare?merchant=megababiesusa-com&product_id=gid%3A%2F%2Fshopify%2FProduct%2F8073053044990&variant_id=gid%3A%2F%2Fshopify%2FProductVariant%2F44076864209150). - Ruby Onyx: USD 279.99; in stock. Variant id: `gid://shopify/ProductVariant/44076864176382` - Seller: megababiesusa\.com. Price: USD 279\.99. Stock: in stock. Variant: Ruby Onyx, variant id `gid://shopify/ProductVariant/44076864176382`. shipping not recorded; confirmed at merchant checkout. returns not recorded; confirmed at merchant checkout. [Public evidence](https://top-stroll.myshopify.com/products/britax-willow%E2%84%A2-s-infant-car-seat-with-alpine-base-graphite-onyx). [Comparison page](/compare/want/car-seats-that-come-with-an-infant-insert-for-newborns). [Get ready to buy from megababiesusa\.com: prepare checkout](/checkout-prepare?merchant=megababiesusa-com&product_id=gid%3A%2F%2Fshopify%2FProduct%2F8073053044990&variant_id=gid%3A%2F%2Fshopify%2FProductVariant%2F44076864176382). ## Checked facts Each fact below was checked against the source it cites before it was published. Each carries that source's link and the time RoboTrunk read it. 42 checked facts, checked 2026-10-18T00:14:46.670Z. Research depth: trimmed read. Deep read: the store's own data and 7 outside pages \(the store's own product page; maker page; review; regulator recall search \(CPSC \(United States\)\); regulator recall search \(Health Canada\); official safety test results \(CREP, the Child Restraint Evaluation Program\); official safety test results \(NHTSA's Car Seat Ease of Use Ratings\)\), each read in full by RoboTrunk and trimmed to its main content, then written up and checked\. Facts from the maker or a manual quote the page word for word; what real users report is summarised with a link to the page read\. Recall status was checked directly with CPSC \(United States\), Health Canada: CPSC search returned no recall records for Britax\. Health Canada's 23 Britax records include child car seat recalls, but none names the Willow S Infant Car Seat \+ Alpine Base, so no recall applies to this exact model\. Official safety test results were looked up directly with CREP, the Child Restraint Evaluation Program, NHTSA's Car Seat Ease of Use Ratings: CREP, the Child Restraint Evaluation Program \(Australia and New Zealand\): CREP's published list of 216 tested seats includes many Britax Safe\-N\-Sound models but no Britax Willow S Infant Car Seat \+ Alpine Base\. The list is complete, so CREP has not rated this seat\. NHTSA's Car Seat Ease of Use Ratings \(United States\): NHTSA lists Britax Willow S model E1C993XDI, made 2024\-07\-08, rear\-facing, child weight 4\-30 lb and height up to 32 in: overall 4 of 5 stars; securing child 3, labels 5, vehicle installation 5, instructions 3\. These are ease\-of\-use ratings, not crash\-test results\. Not read, because they are member\-only or refused RoboTrunk: Consumer Reports car seat ratings, Which? child car seat tests, JPMA certified products\. - overview: The Willow S is a rear\-facing infant car seat that includes the Alpine travel base\.. Source: (listing), read 2026-10-17T19:35:52.669Z. - base\-free installation: There is an extra belt path on the back of the seat for base\-free installation\.. Source: (guide), read 2026-10-18T00:02:45.783Z. - aggregate sentiment: The review page shows a 71% positive sentiment score across 10 reviews\.. Source: (review), read 2026-10-18T00:02:59.698Z. - safety test: NHTSA's ease\-of\-use ratings list Britax Willow S model E1C993XDI, made 2024\-07\-08, rear\-facing, at overall 4 of 5 stars and securing the child 3 of 5; these rate ease of use, not crash protection \(https://api\.nhtsa\.gov/childSeats?dataSet=ratings\)\.. Source: (guide), read 2026-10-18T00:03:02.545Z. - weight range: The seat is rear\-facing only and rated for babies from 4 to 30 lb\.. Source: (listing), read 2026-10-17T19:35:52.669Z. - LATCH: Quick\-Push LATCH connectors lock with a click and release with a button push\.. Source: (guide), read 2026-10-18T00:02:45.783Z. - daily use: A user with the Willow and its base likes being able to pop the seat in and out without using the seat belt every time or strapping the baby in at an awkward angle\.. Source: (review), read 2026-10-18T00:02:59.698Z. - labels: NHTSA's tester noted the labels were already peeling when the restraint came out of its packaging\.. Source: (guide), read 2026-10-18T00:03:02.545Z. - dimensions: The listed dimensions are 28\.1 in deep, 16\.9 in wide and 24\.1 in high\.. Source: (listing), read 2026-10-17T19:35:52.669Z. - canopy: The canopy is UPF 50\+ and has a flip\-down visor and peek\-a\-boo window on select fashions\.. Source: (guide), read 2026-10-18T00:02:45.783Z. - installation and fit: A user report says the base install is very easy, the seat has many harness adjustments for newborn fit, and the two\-piece infant insert shifts when placing the baby, which is mildly annoying but short\-lived\.. Source: (review), read 2026-10-18T00:02:59.698Z. - instructions: NHTSA rated evaluation of instructions at 3 of 5 stars for the Willow S\.. Source: (guide), read 2026-10-18T00:03:02.545Z. - weight: Carrier with base weighs 18\.1 lb\.. Source: (listing), read 2026-10-17T19:35:52.669Z. - safety standards: The seat is side\-impact tested to FMVSS 213a and meets FMVSS 213 frontal\-impact standards\.. Source: (guide), read 2026-10-18T00:02:45.783Z. - compatibility: A buyer reports the Willow S works with an Uppababy adapter\.. Source: (review), read 2026-10-18T00:02:59.698Z. - harness adjustment: NHTSA notes the harness must be rethreaded to adjust height as the child grows\.. Source: (guide), read 2026-10-18T00:03:02.545Z. - weight: Carrier alone weighs 9\.2 lb\.. Source: (listing), read 2026-10-17T19:35:52.669Z. - materials: The fabrics are naturally flame\-retardant with no added FR chemicals\.. Source: (guide), read 2026-10-18T00:02:45.783Z. - manufacturing date: A buyer reports delivered Willow S units had a September 2023 manufacturing date and received the same date twice\.. Source: (review), read 2026-10-18T00:02:59.698Z. - height limit: NHTSA's listing gives a child height limit of up to 32\.0 in for the rated Willow S\.. Source: (guide), read 2026-10-18T00:03:02.545Z. - weight: The base alone weighs 10\.2 lb\.. Source: (listing), read 2026-10-17T19:35:52.669Z. - comfort: Britax says the soft cushioning and harness padding help keep the child comfortable\.. Source: (guide), read 2026-10-18T00:02:45.783Z. - interior dimensions: Seat back compartment height is 21 in\.. Source: (listing), read 2026-10-17T19:35:52.669Z. - warning: Britax warns that weight and height ranges may vary by model and says to follow the user guide and product labels\.. Source: (guide), read 2026-10-18T00:02:45.783Z. - harness fit: Harness slot heights are 5\.5, 7\.5, 9\.5 and 11\.5 in\.. Source: (listing), read 2026-10-17T19:35:52.669Z. - warning: Britax says actual product may vary from images and reserves the right to substitute fabrics or parts\.. Source: (guide), read 2026-10-18T00:02:45.783Z. - buckle fit: Buckle strap depths are 2\.25 and 5\.5 in\.. Source: (listing), read 2026-10-17T19:35:52.669Z. - interior dimensions: Seat area is 12 in deep and 9\.5 in wide\.. Source: (listing), read 2026-10-17T19:35:52.669Z. - interior dimensions: Shoulder width is 10 in\.. Source: (listing), read 2026-10-17T19:35:52.669Z. - installation: A ClickTight indicator gives a visual guide while installing the base\.. Source: (listing), read 2026-10-17T19:35:52.669Z. - harness adjustment: RightSize provides adjustment points at the hips, shoulders and between the legs\.. Source: (listing), read 2026-10-17T19:35:52.669Z. - care: The SafeWash fabrics are washer and dryer friendly\.. Source: (listing), read 2026-10-17T19:35:52.669Z. - materials: The fabrics are naturally flame\-retardant and safe to wash and dry\.. Source: (listing), read 2026-10-17T19:35:52.669Z. - included insert: An infant insert pillow is included for newborns under 11 lb\.. Source: (listing), read 2026-10-17T19:35:52.669Z. - energy management: SafeCell Technology is designed to manage energy and minimize force transferred to the baby\.. Source: (listing), read 2026-10-17T19:35:52.669Z. - stability: A Rebounder stability bar helps minimize movement in a crash, and the carry handle adds stability when upright\.. Source: (listing), read 2026-10-17T19:35:52.669Z. - harness comfort: The padded harness has an extra cushioning layer intended to help prevent skin irritation\.. Source: (listing), read 2026-10-17T19:35:52.669Z. - installation angle: Level indicators and spring\-assist recline help find the correct installation angle\.. Source: (listing), read 2026-10-17T19:35:52.669Z. - space: The SpaceSaver design is described as slim outside and spacious inside to free up backseat space\.. Source: (listing), read 2026-10-17T19:35:52.669Z. - stroller compatibility: It is compatible with Britax Modular and select competitive strollers\.. Source: (listing), read 2026-10-17T19:35:52.669Z. - warranty: Britax lists a 1\-year warranty\.. Source: (listing), read 2026-10-17T19:35:52.669Z. - expiration: The seat expires after 6 years\.. Source: (listing), read 2026-10-17T19:35:52.669Z. The full evidence pack, with every citation, source and gap: [evidence pack](/agent/evidence/megababiesusa-com--britax-willow%E2%84%A2-s-infant-car-seat-with-alpine-base-graphite-onyx) ## Questions we researched but could not confirm Every fact above is cited. To find them we read the store listing, the maker's page, owner reviews, the recall records of CPSC \(United States\) and Health Canada and the safety test results of CREP, the Child Restraint Evaluation Program and NHTSA's Car Seat Ease of Use Ratings and searched for the manual, regulator recall notices, blogs, owner forums and video reviews. We also chased the questions below across those sources and found no reliable answer, so you know exactly where the evidence ends and never have to guess. - How thick and plush are the fabrics in person? - Does the fabric pill or the coating rub off over time? - Which exact stroller models attach without an adapter? - What tools are needed to install the Alpine base? - What is the age limit for this seat? - Can the harness straps be machine washed and dried? - What exactly is included in the box besides the seat, base and infant insert? - What does the one\-year warranty cover? - How did it perform in independent crash tests beyond FMVSS self\-certification? - Which colorways include the peek\-a\-boo canopy window? - Can the seat be used on an airplane? - Does the infant insert have to be removed at exactly 11 lb? To buy this through RoboTrunk, pass merchant `megababiesusa-com`, product_id `gid://shopify/Product/8073053044990` and one variant_id from the list above. Product image of Britax Willow S Infant Car Seat \+ Alpine Base, supplied by megababiesusa\.com: This product on megababiesusa.com: Retrieved 2026-10-24T19:31:58.346Z from This page is published by RoboTrunk, a store built for shopping agents. The store named on this page sells the product and ships it. RoboTrunk is not the seller and never holds the money. Buying works in one path. RoboTrunk's tools prepare a checkout at that store, then hand back a short-lived link. The person approves the total; once RoboTrunk has checked the store's total against it, the person is given the checkout link to tap in their own browser, or, if the person prefers and gives permission, their agent may open the link and finish there, and payment always happens on the store's own checkout page. RoboTrunk never takes the payment or sees a card. 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