Little Unicorn Cotton Muslin Sleep Bag review

Little Unicorn Cotton Muslin Sleep Bag ranks seventh. Little Unicorn makes it from lightweight, breathable cotton muslin that the company says helps prevent overheating and gets softer with every wash. The standard bag is 1.1 TOG, and a 2.6 TOG quilted version adds layers of muslin for cooler months and air-conditioned homes, with a breathable chest and shoulder panel. The two-way zipper is extra wide and reinforced for frequent night openings. The size chart lists weight, height and age for each size, from Small at 10 to 18 lb and 0 to 6 months up to X-Large at 27 to 30 lb and 18 to 24 months, and the bag leaves room for the hips and legs. It is a pleasant, well-specified sack, but at $49.99 it costs more than the HALO cotton sack without a published room temperature range, and it offers nothing extra for babies still leaving the swaddle. We compared documented features and published prices.

Who it is for

Parents who like breathable muslin and want a quilted option for cooler months.

Price

$49.99 on the Little Unicorn US store when checked.

Cotton Muslin Sleep Bag - Butterflies 0 Reviews $ 49.99
Quoted from the vendor pricing page on November 9, 2026.

Key features

• Lightweight, breathable cotton muslin
• 1.1 TOG, with a 2.6 TOG quilted version
• Extra wide, reinforced two-way zipper
• Room for the hips and legs to move naturally
• Sizes Small (10 to 18 lb) to X-Large (27 to 30 lb)

Strengths and weaknesses

• Strength: Muslin gets softer with every wash, per the maker
• Strength: Quilted 2.6 TOG bag for cool rooms and air-conditioned homes
• Strength: Clear size chart with weight, height and age
• Weakness: No published room temperature range for the 1.1 TOG bag
• Weakness: Costs more than HALO's cotton sack
• Weakness: No transition features

Key facts

• Price: $49.99 when checked
• TOG: 1.1 or 2.6 quilted
• Fabric: Cotton muslin
• Sizes: 10 to 30 lb in four sizes

Where it ranks

Little Unicorn Cotton Muslin Sleep Bag is No. 7 in our Best Baby Sleep Sacks verdict.