# Sleep sacks that fit a newborn's neck and body Which sleep sacks fit a newborn well around the neck and body? ergoPouch Cocoon Swaddle Sack: The swaddle is deliberately firm around the neck, shoulders and chest so the baby cannot slip down inside it\. ergoPouch says the correct fit is when two fingers can be placed inside the neck opening\. Size 0\-3M \(000\) is 60 cm long, for babies 3\-6 kg and about 62 cm tall\. Caution: Reports that the bag creeps up over the baby's face during the night, even in what parents believed was the correct size, appear several times, and two parents describe it as a suffocation risk\. ergoPouch Cocoon Swaddle Sack 2\.5 TOG: Parents in the discussions most praise the press\-stud arm options, especially for babies who roll early, while the bag still feels firm across the chest\. The size chart says to choose the size by the child's weight rather than age for safety\. Several parents report the bag riding up over the baby's face while their arms are in, including during naps and overnight, which they describe as frightening\. Swaddelini Black Swaddle Sleep Sack: The product page describes a seamless 3D\-knit construction for cozy, secure wear\. 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\. ### 1. [ergoPouch Cocoon Swaddle Sack](/products/ucp/ergopouch-com/8261733449897) (sold by ergopouch\.com) The swaddle is deliberately firm around the neck, shoulders and chest so the baby cannot slip down inside it\. - Neck and chest fit: The swaddle is deliberately firm around the neck, shoulders and chest so the baby cannot slip down inside it\. (manual) - Newborn sizing: Size 0\-3M \(000\) is 60 cm long, for babies 3\-6 kg and about 62 cm tall\. (manual) - Neck opening check: ergoPouch says the correct fit is when two fingers can be placed inside the neck opening\. (manual) - Face coverage caution: Reports that the bag creeps up over the baby's face during the night, even in what parents believed was the correct size, appear several times, and two parents describe it as a suffocation risk\. (review) ### 2. [ergoPouch Cocoon Swaddle Sack 2\.5 TOG](/products/ucp/ergopouch-com/8806347473065) (sold by ergopouch\.com) Parents in the discussions most praise the press\-stud arm options, especially for babies who roll early, while the bag still feels firm across the chest\. - Neck and chest fit: Parents in the discussions most praise the press\-stud arm options, especially for babies who roll early, while the bag still feels firm across the chest\. (review) - Newborn sizing: Size 0\-3M has a pouch length of 60 cm and is intended for babies weighing 3\-6 kg and 62 cm tall\. (manual) - Neck opening check: - - Face coverage caution: Several parents report the bag riding up over the baby's face while their arms are in, including during naps and overnight, which they describe as frightening\. (review) ### 3. [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\. - Neck and chest fit: The product page describes a seamless 3D\-knit construction for cozy, secure wear\. (guide) - Newborn sizing: 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) - Neck opening check: - - Face coverage caution: - ## Also cited in the text - ergoPouch Cocoon Swaddle Sack 2\.5 TOG, fitting rule: The size chart says to choose the size by the child's weight rather than age for safety\. (manual) 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 2026-10-26T20:10:37.297Z. 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)