# Booster car seats by child age and weight Which booster car seats fit a child of a given age and weight? Britax Highpoint 2\-Stage: This 2\-in\-1 seat converts from a high\-back booster for 40\-120 lbs / 44\-63 inches to a backless booster for 48\-120 lbs / 46\-63 inches\. Axkid Up: The store's own listing says the Axkid Up is a high\-back booster seat for children about 4 to 12 years old, 40 to 120 lb and 43\.3 to 60 inches tall; Axkid's own page gives different limits \(100–150 cm and up to 50 kg\), so the two sources disagree\. ### 1. [Britax Highpoint 2\-Stage](/products/ucp/albeebaby-com/9564460155111) (sold by albeebaby\.com) This 2\-in\-1 seat converts from a high\-back booster for 40\-120 lbs / 44\-63 inches to a backless booster for 48\-120 lbs / 46\-63 inches\. - Age, weight and height limits: This 2\-in\-1 seat converts from a high\-back booster for 40\-120 lbs / 44\-63 inches to a backless booster for 48\-120 lbs / 46\-63 inches\. (guide) - Installation: - - Weight: Specs listed 16 by 21\.5 by 35 inches, 12 pounds, and 40\-120 pound weight capacity\. (blog) - Expert rating: Consumer Reports gave an overall score of 33/100, with booster fit 2/5 with back, 1/5 no\-back, and ease of use 5/5\. (review) ### 2. [Axkid Up](/products/ucp/albeebaby-com/9722100842727) (sold by albeebaby\.com) The store's own listing says the Axkid Up is a high\-back booster seat for children about 4 to 12 years old, 40 to 120 lb and 43\.3 to 60 inches tall; Axkid's own page gives different limits \(100–150 cm and up to 50 kg\), so the two sources disagree\. - Age, weight and height limits: The store's own listing says the Axkid Up is a high\-back booster seat for children about 4 to 12 years old, 40 to 120 lb and 43\.3 to 60 inches tall; Axkid's own page gives different limits \(100–150 cm and up to 50 kg\), so the two sources disagree\. (listing) - Installation: The manual covers three installation routes: ISOFIX with support leg, ISOFIX without the support leg, and no ISOFIX or support leg \(seat belt only\)\. (manual) - Weight: The reviewer, opening the box cold, found the steel frame makes the seat genuinely heavy at about 21 lb and noted it works for ages 4 to 12 from 40 lb and 43\.3 inches, staying high\-back only\. (review) - Expert rating: In ADAC's child seat test the Axkid Up was tested in 2025 and given an overall grade of 2\.0 on ADAC's scale \(0\.5 very good to 5\.5 poor\), age class Kind, approved for 100 cm to 150 cm\. (guide) 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 2026-10-12T03:15:11.416Z. 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. Where the rest of this site is: - /agent/story.md is what RoboTrunk is and how it works, in full. - /agent/tools.json is every tool, its arguments and its answers. - /agent/merchants is every store you can buy from through RoboTrunk. - /products/ucp is every store's indexed products. - /products/search is one search across every store, in plain words. - [What RoboTrunk is](/agent/story.md) - [Every tool, in your browser through WebMCP](/agent) - [The tools and how to call them](/agent/tools.json) - [The stores you can buy from](/agent/merchants) - [Every store's products](/products/ucp) - [Search every store at once](/products/search)