# Youngest Age for a Child Bike Seat or Trailer What is the youngest age a child can ride in a bike seat or trailer? THULE 20101000: It is for babies aged 1–10 months who cannot sit without assistance\. THULE Coaster XT: It seats up to two children and the manual specifies an age range of 6 months to 4 years\. Cybex Zeno Bike: The child must be at least 6 months old and able to sit upright without assistance\. THULE RideAlong 100107: The US store lists use from 9 months through 6 years and up to 22 kg \(48\.5 lb\), with a pediatrician consultation for children under one year; the installation manual instead limits the USA and Canada to 18 kg \(40 lb\), so the sources disagree on the weight limit\. Thule Yepp 2 Maxi: Thule says children generally may begin at nine months only when they can sit upright unsupported, and a pediatrician should be consulted for a child under one year\. Thule Yepp 2 Mini: The manual specifies an age range of 9–36 months\. THULE Yepp Maxi EasyFit: The manual marks the seat as unsuitable from birth through 9 months\. ### 1. [THULE 20101000](/products/ucp/anbbaby-com/4647735951446) (sold by anbbaby\.com) It is for babies aged 1–10 months who cannot sit without assistance\. - Age range: It is for babies aged 1–10 months who cannot sit without assistance\. (guide) - Use: This is a padded infant sling for carrying a baby in a compatible bike trailer while it is configured for strolling\. (guide) - Child limits: The maximum child weight is 10 kg \(22 lb\), and maximum height is 75 cm \(29\.5 inches\)\. (guide) ### 2. [THULE Coaster XT](/products/ucp/anbbaby-com/4645704400982) (sold by anbbaby\.com) It seats up to two children and the manual specifies an age range of 6 months to 4 years\. - Age range: It seats up to two children and the manual specifies an age range of 6 months to 4 years\. (manual) - Use: It converts between a bicycle trailer and a stroller\. (guide) - Child limits: - ### 3. [Cybex Zeno Bike](/products/ucp/anbbaby-com/8003570106654) (sold by anbbaby\.com) The child must be at least 6 months old and able to sit upright without assistance\. - Age range: It is intended for children from 6 months to approximately 4 years, subject to the developmental cycling restrictions\. (guide) - Use: It converts between a child bicycle trailer and a stroller intended to be pushed at walking pace\. (guide) - Child limits: Maximum child weight is 49 lb \(22 kg\), maximum child height is 44 in \(111 cm\), and total load capacity is 75 lb \(34 kg\)\. (guide) ### 4. [THULE RideAlong 100107](/products/ucp/anbbaby-com/4695131586646) (sold by anbbaby\.com) The US store lists use from 9 months through 6 years and up to 22 kg \(48\.5 lb\), with a pediatrician consultation for children under one year; the installation manual instead limits the USA and Canada to 18 kg \(40 lb\), so the sources disagree on the weight limit\. - Age range: The US store lists use from 9 months through 6 years and up to 22 kg \(48\.5 lb\), with a pediatrician consultation for children under one year; the installation manual instead limits the USA and Canada to 18 kg \(40 lb\), so the sources disagree on the weight limit\. (guide) - Use: The RideAlong is an adjustable child seat mounted at the rear of a bicycle\. (manual) - Child limits: - ### 5. [Thule Yepp 2 Maxi](/products/ucp/anbbaby-com/9380094116126) (sold by anbbaby\.com) Thule says children generally may begin at nine months only when they can sit upright unsupported, and a pediatrician should be consulted for a child under one year\. - Age range: Thule says children generally may begin at nine months only when they can sit upright unsupported, and a pediatrician should be consulted for a child under one year\. (guide) - Use: The manual identifies it as the Thule Yepp 2 Maxi frame\-mount rear child bicycle seat, model family 120213XX\. (manual) - Child limits: - ### 6. [Thule Yepp 2 Mini](/products/ucp/anbbaby-com/9379969892638) (sold by anbbaby\.com) The manual specifies an age range of 9–36 months\. - Age range: The manual specifies an age range of 9–36 months\. (manual) - Use: - - Child limits: The permitted child weight is 9–15 kg \(20–33 lb\)\. (manual) ### 7. [THULE Yepp Maxi EasyFit](/products/ucp/anbbaby-com/4698292191318) (sold by anbbaby\.com) The manual marks the seat as unsuitable from birth through 9 months\. - Age range: The manual marks the seat as unsuitable from birth through 9 months\. (manual) - Use: This is a child bike seat intended for everyday rides\. (guide) - Child limits: - ## Also cited in the text - Cybex Zeno Bike, Development warning: The child must be at least 6 months old and able to sit upright without assistance\. (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 2026-10-24T01:14:04.121Z. 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. 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