# Convertible Car Seats That Also Work as Boosters Which convertible car seats can also be used later as a booster seat? Britax One4Life All\-in\-One Car Seat: One seat covers three stages and is sold as growing with the child for 10 years: rear\-facing infant and toddler use 5\-50 lb, forward\-facing harness use 30\-65 lb, and high\-back booster use 40\-120 lb\. Cybex Gold Eternis S Sensor Safe All\-In\-One Car Seat: It is an all\-in\-one convertible with rear\-facing, forward\-facing and booster modes, from birth to 120 lb\. Joie Baby Saffron SI: It converts from rearward\-facing to forward\-facing, then to highback booster and backless booster\. Safety 1ST Grow and Go™ All\-in\-One Convertible Car Seat: It is a convertible car seat that works rear\-facing, forward\-facing and as a belt\-positioning booster for children from 5 to 100 lb\. Graco SlimFit 3\-in\-1 Narrow All\-in\-One Convertible Car Seat \- Sydney: It is a 3\-in\-1 all\-in\-one convertible car seat that can be used rear\-facing, forward\-facing, and as a belt\-positioning booster\. Graco SlimFit3 LX: The seat grows from a rear\-facing harness to a forward\-facing harness to a highback booster\. Evenflo All4Stages Slim 4\-in\-1 Convertible Car Seat: from birth to booster ### 1. [Britax One4Life All\-in\-One Car Seat](/products/ucp/strolleria-com/8076366905418) (sold by strolleria\.com) One seat covers three stages and is sold as growing with the child for 10 years: rear\-facing infant and toddler use 5\-50 lb, forward\-facing harness use 30\-65 lb, and high\-back booster use 40\-120 lb\. - Booster mode: One seat covers three stages and is sold as growing with the child for 10 years: rear\-facing infant and toddler use 5\-50 lb, forward\-facing harness use 30\-65 lb, and high\-back booster use 40\-120 lb\. (listing) - Booster weight: One seat covers three stages and is sold as growing with the child for 10 years: rear\-facing infant and toddler use 5\-50 lb, forward\-facing harness use 30\-65 lb, and high\-back booster use 40\-120 lb\. (listing) - Dimensions: The store's own page gives the seat's overall size as 18\.5 in long, 17\.5 in wide and 24\.5 in high\. (guide) ### 2. [Cybex Gold Eternis S Sensor Safe All\-In\-One Car Seat](/products/ucp/megababiesusa-com/6761164505241) (sold by megababiesusa\.com) Rear\-facing is 4\-50 lb, forward\-facing with harness is 22\-65 lb, and belt\-positioning booster is 40\-120 lb\. - Booster mode: It is an all\-in\-one convertible with rear\-facing, forward\-facing and booster modes, from birth to 120 lb\. (guide) - Booster weight: Rear\-facing is 4\-50 lb, forward\-facing with harness is 22\-65 lb, and belt\-positioning booster is 40\-120 lb\. (guide) - Dimensions: - ### 3. [Joie Baby Saffron SI \(model C2401AA; SKUs begin C2401AA\)](/products/ucp/strolleria-com/7897047597130) (sold by strolleria\.com) The manual lists the highback booster weight range as 40 to 100 lb\. - Booster mode: It converts from rearward\-facing to forward\-facing, then to highback booster and backless booster\. (listing) - Booster weight: The manual lists the highback booster weight range as 40 to 100 lb\. (manual) - Dimensions: Product dimensions are 22 in long, 19 in wide, and 24\.5 to 33 in high\. (guide) ### 4. [Safety 1ST Grow and Go™ All\-in\-One Convertible Car Seat](/products/ucp/megababiesusa-com/8585882894590) (sold by megababiesusa\.com) It is a convertible car seat that works rear\-facing, forward\-facing and as a belt\-positioning booster for children from 5 to 100 lb\. - Booster mode: It is a convertible car seat that works rear\-facing, forward\-facing and as a belt\-positioning booster for children from 5 to 100 lb\. (listing) - Booster weight: - - Dimensions: The seat measures 24\.5 in\. deep, 19\.25 in\. wide and 24\.25 in\. high\. (guide) ### 5. [Graco SlimFit 3\-in\-1 Narrow All\-in\-One Convertible Car Seat \- Sydney](/products/ucp/albeebaby-com/9564479750375) (sold by albeebaby\.com) It is a 3\-in\-1 all\-in\-one convertible car seat that can be used rear\-facing, forward\-facing, and as a belt\-positioning booster\. - Booster mode: It is a 3\-in\-1 all\-in\-one convertible car seat that can be used rear\-facing, forward\-facing, and as a belt\-positioning booster\. (listing) - Booster weight: - - Dimensions: - ### 6. [Graco SlimFit3 LX](/products/ucp/albeebaby-com/9685796585703) (sold by albeebaby\.com) The seat grows from a rear\-facing harness to a forward\-facing harness to a highback booster\. - Booster mode: The seat grows from a rear\-facing harness to a forward\-facing harness to a highback booster\. (listing) - Booster weight: - - Dimensions: The seat measures about 20\.7 inches long by 16\.7 inches wide by 24\.5 inches high\. (blog) ### 7. [Evenflo All4Stages Slim 4\-in\-1 Convertible Car Seat](/products/ucp/evenflo-com/8602499711132) (sold by evenflo\.com) from birth to booster - Booster mode: from birth to booster (listing) - Booster weight: 120 lbs (listing) - Dimensions: 16\.9 in\. (listing) Every value in the table is a fact RoboTrunk checked, linked to the page it came from\. A dash means no checked fact fills that cell\. Prices and stock change, so this page prints neither: each product name links to its RoboTrunk page, which shows them live\. Written 2026-10-30T12:17:12.801Z. 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. 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