# Baby sleep sacks with a size range from the earliest weeks onward Which baby sleep sacks come in a range of sizes that can be used from the earliest weeks and as the baby grows? Swaddelini Black Swaddle Sleep Sack: The small fits babies 6\-12 lbs; if a baby is born over 9 lbs the maker still advises small because large will be too big; large fits 12\-18 lbs comfortably\. The maker's store lists a Small variant for 6\-12 pounds\. Swaddelini Arms Out™ Long Sleeve Sleep Sack: It comes in Small \(12lbs \- 18lbs\), Large \(18lbs \- 25lbs\) and Extra Large \(25lbs \- 40lbs\); the description calls out the 18\-25 pound range\. It is meant for when a child begins to roll and explore\. Swaddelini Arms Out™ Short Sleeve Sleep Sack: It comes in Small \(12lbs \- 18lbs\), Large \(18lbs \- 25lbs\) and Extra Large \(25lbs \- 40lbs\); the description calls out the 18\-25 pound range\. It is meant for when a child begins to roll and explore\. ### 1. [Swaddelini Black Swaddle Sleep Sack](/products/ucp/strolleria-com/8102224068682) (sold by strolleria\.com) The small fits babies 6\-12 lbs; if a baby is born over 9 lbs the maker still advises small because large will be too big; large fits 12\-18 lbs comfortably\. - Size range: The small fits babies 6\-12 lbs; if a baby is born over 9 lbs the maker still advises small because large will be too big; large fits 12\-18 lbs comfortably\. (manual) - Stage of use: - - Fit guidance: When the baby rolls over, the user should leave arms out, which makes the Swaddelini a wearable blanket\. (manual) ### 2. [Swaddelini Arms Out™ Long Sleeve Sleep Sack](/products/ucp/strolleria-com/7961557860426) (sold by strolleria\.com) It comes in Small \(12lbs \- 18lbs\), Large \(18lbs \- 25lbs\) and Extra Large \(25lbs \- 40lbs\); the description calls out the 18\-25 pound range\. - Size range: It comes in Small \(12lbs \- 18lbs\), Large \(18lbs \- 25lbs\) and Extra Large \(25lbs \- 40lbs\); the description calls out the 18\-25 pound range\. (listing) - Stage of use: It is meant for when a child begins to roll and explore\. (listing) - Fit guidance: - ### 3. [Swaddelini Arms Out™ Short Sleeve Sleep Sack](/products/ucp/strolleria-com/7961558843466) (sold by strolleria\.com) It comes in Small \(12lbs \- 18lbs\), Large \(18lbs \- 25lbs\) and Extra Large \(25lbs \- 40lbs\); the description calls out the 18\-25 pound range\. - Size range: It comes in Small \(12lbs \- 18lbs\), Large \(18lbs \- 25lbs\) and Extra Large \(25lbs \- 40lbs\); the description calls out the 18\-25 pound range\. (listing) - Stage of use: It is meant for when a child begins to roll and explore\. (listing) - Fit guidance: - ## Also cited in the text - Swaddelini Black Swaddle Sleep Sack, size: The maker's store lists a Small variant for 6\-12 pounds\. (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 2026-10-17T04:36:09.144Z. 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)