Baby Sleep Bag 1.0 TOG in TENCEL™ Lyocell - Alphabet Smiles

The blanket gets kicked off at 1 a.m.; the sleep bag doesn't. That's the whole argument, and it wins every night.

Letters, rainbows, donuts, and watermelons — the alphabet, but friendlier.

This is the year-round weight, the one you'll use about nine months of the year in a 69–75°F nursery. It's the everyday workhorse of the line — warm enough for a typical night, light enough that the baby never wakes up overheated.

Material. A TENCEL™ Lyocell shell over a light layer of DuPont™ Sorona insulation, a plant-based fill that holds warmth without bulk.

The print. Pale mint-seafoam ground with multicolored hand-drawn letters A through Z, smiling apples and watermelon slices, ladybugs, suns, rainbows, donuts, umbrellas, small flowers.

Construction. Sleeveless on purpose, so your baby sheds heat instead of trapping it. A two-way zipper runs the length of the bag, so a midnight diaper change takes seconds and wakes nobody. The neck and arm openings are bound in soft fabric, not scratchy serged edges, and cut snug — the part that matters most for safe sleep.

Why TENCEL™ for a year-round bag. A 1.0 TOG is worn most nights and washed twice a week, so the fiber has to keep its hand. TENCEL™ Lyocell stays smooth and breathable through heavy laundering and carries heat off the skin instead of trapping it.

Adjacent TOGs in the same print. Room running warm? The 0.5 TOG Muslin Sleep Bag in Alphabet Smiles covers 75–81°F summer nurseries. Cold nursery in winter? The 2.5 TOG TENCEL™ Sleep Bag picks up at 61–68°F.

Sizing. 0–6M (8–18 lb), 6–18M (18–28 lb), 18–36M (28–38 lb). Size to current weight. The 0–6M usually carries a baby through to the 4-month sleep regression; the 6–18M is usually the size your baby wears the longest.

Care. Machine wash cold and tumble dry low. Don't bleach, and don't iron the printed areas. TENCEL™ keeps its smooth face through the twice-or-thrice-weekly wash a baby's wardrobe demands.

Safety & certification. AAP safe-sleep compliant. Tested to CPSC, CPSIA, and ASTM standards. Material certified to OEKO-TEX Standard 100. Loulou Lollipop is a Certified B Corporation.

Common questions

Why TENCEL™ for this sleep bag instead of muslin?

TENCEL™ Lyocell is a wood-pulp fiber spun in a closed-loop process. It pulls moisture off the skin quickly and stays soft and keeps its look through repeated washing, so we use it in our year-round 1.0 and 2.5 TOG sleep bags, the ones that get washed most. For the lightest warm-weather layers, you might want our products made with Tanboocel® Bamboo Viscose — like the 0.5 TOG sleep bags, swaddles, and crib sheets.

What TOG rating should my baby wear?

Match the TOG to the room. 0.5 TOG for 75–81°F. 1.0 TOG for 69–75°F, the most common nursery temperature in the US. 2.5 TOG for 61–68°F cold nurseries. A nursery thermometer removes the guesswork.

What should baby wear under a 1.0 TOG sleep sack?

A short-sleeve bodysuit at the top end of the range (74–75°F), a long-sleeve bodysuit in the middle (70–73°F), or a sleeper at the cool end (69–70°F). The TOG rating gives you the main warmth; what your baby wears underneath lets you fine-tune from there.

Browse all baby sleep sacks.

Free US shipping over $65. Free 30-day returns on unworn items in original packaging.

Part of the Big Dreams Sleep System. Sleepers and sleep bags in Alphabet Smiles are built to layer together through the night — same print, one system. Complete the set with the Tanboocel® Bamboo Viscose 0.5 TOG Sleep Bag and TENCEL™ Sleeper.