We prioritize gentle, skin-friendly fabrics for delicate newborn skin. Our sleep sacks and pajamas are made from high-density organic cotton and breathable bamboo viscose. They are pre-washed, hypoallergenic, and free from harsh chemicals—making them ideal for babies with eczema or sensitive skin.

TOG (Thermal Overall Grade) measures warmth:

• 0.5 TOG (Ultra-Light): Best for summer or warm nurseries (75°F–80°F / 24°C–27°C). Keeps hot sleepers dry and sweat-free.
• 1.0 TOG (All-Season): Ideal for room temperatures between 68°F–72°F (20°C–22°C). Pair with footie pajamas for cozy, year-round sleep.

Our 2-way zippers allow you to unzip the sleep sack from the bottom up. This means you can change diapers at 2 a.m. quickly and quietly without fully removing the sleep sack or exposing your baby's chest to chilly room air.

Yes! We design our products for real-life parenting messes. Yoofoss sleep sacks and muslin blankets are built to hold up through endless laundry cycles without losing their shape or buttery softness.

We recommend choosing a size based on your baby's weight and height, rather than age alone. A sleep sack should fit comfortably around the neck and armholes so your baby’s head cannot slip inside the garment. Please refer to our detailed Size Chart on each product page.

For safety reasons, we do not recommend sizing up on sleep sacks. An oversized neck opening can pose a safety hazard if the fabric slides up over the baby's mouth or nose. Always pick the size that matches your baby's current measurements.

1. Machine wash on a gentle cycle with cold water with like colors.
2. Zip up all zippers before washing to prevent snagging.
3. Tumble dry on low heat or line dry.
4. Avoid using bleach or fabric softeners, as natural bamboo and muslin get naturally softer with every wash!

Orders are processed within 1–2 business days. Standard US shipping typically takes 3–5 business days. Once your order ships, you will receive a tracking link via email.

We want you and your baby to love your purchase! We offer a 30-day hassle-free return policy. If you are not completely satisfied, you can return unwashed and unused items in their original packaging for a full refund or exchange.

We apologize for the trouble! Please email our support team at support@yoofoss.com with your order number and a quick photo of the item, and we will send you a replacement immediately at no extra charge.