Australian Merino Wool Baby Sleep Bag - Passive Temperature Regulating | Celestial Blue

Slumberpea Sleep Sack: Why Parents Choose Natural Over Synthetic

🌿 Nature's Finest Materials

Pure Australian merino wool interior meets GOTS-certified organic cotton exterior. Hypoallergenic, breathable, and gentle enough for the most sensitive skin—no chemicals, no compromises.

🌡️ True All-Season Comfort

Stop buying separate summer and winter sleep sacks. Our merino wool naturally adapts to your baby's body temperature across 63-75°F (17-24°C). When baby is warm, it cools. When baby is cool, it insulates. One sleep sack. Every season. Every night.

👶 Adapts as Baby Grows

Smart adjustable underarm snaps mean one sleep sack fits from 2 months to 2 years—or 2 to 4 years in our toddler size. No more buying new sizes every few months. Better for your budget and the planet.

💰 Investment That Pays Off

Most parents spend $300+ on multiple sleep sacks over two years. Slumberpea costs less while performing better. Premium quality that lasts through multiple children and still maintains resale value.

⚡ Midnight-Change Friendly Design

Premium YKK two-way zipper opens from top OR bottom—change diapers without fully removing the sleep sack. Your baby barely wakes. You get back to sleep faster. Easy-on shoulder snaps and protective zipper guards complete the thoughtful design.

🚗 Goes Everywhere Baby Goes

Integrated safety belt openings on both front and back work with any car seat, stroller, or high chair. Maintain sleep routines during travel without transferring baby in and out.

✅ Safe Sleep Certified

Replaces dangerous loose blankets in the crib. Keeps baby safely covered all night while promoting back sleeping. Meets AAP safe sleep guidelines and exceeds all US & EU safety standards.

🎁 Complete Sleep Solution

Every Slumberpea sleep sack includes a nursery thermometer with season-specific dressing guidelines. Take the guesswork out of layering—we've done the research for you.

Materials: Organic cotton outer, merino wool inner.

Machine wash cold (85°F max), gentle cycle, in mesh bag. Use wool detergent. Close zippers. Air dry flat or tumble dry no-heat only. Never use high heat. Merino is self-cleaning—air out between washes.

Understanding Sleep Sacks: What Are They?

A sleep sack (also known as a wearable blanket or sleep bag) is a specially designed garment that babies wear for safe sleeping. Think of it as a sleeping bag for infants. The American Academy of Pediatrics has endorsed wearable blankets since 2005 as a safer alternative to loose crib blankets, which can pose suffocation risks. Your baby wears it over their pajamas, and unlike traditional blankets, it won't get kicked off during the night. This creates consistent comfort while becoming a comforting part of your bedtime routine.

Temperature Rating: Will This Work Year-Round?

Our All-Season merino sleep sacks work in all four seasons—no need to switch between summer and winter versions. Here's why: we use 100% natural, breathable fibers with zero synthetic filling, so there's no fixed TOG rating. The magic is in the Australian merino wool lining, which actively regulates your baby's body temperature. When it's warm, the wool naturally cools. When it's cold, it provides warmth.

Recommended room temperature: 63-75°F (17-24°C)

How to adjust: Simply layer up or down on the clothing worn underneath. Each sleep sack includes a room thermometer with dressing guidelines on the back.

Size Guide: How Do I Choose the Right Fit?

We strongly recommend following our sizing chart rather than sizing up. For safety, the sleep sack needs to fit snugly around your baby's chest and shoulders. Use your child's current age, height, and weight to determine the correct size.

Our sizing options:

• 2-24 Months (adjustable with underarm snaps)
• 2-4 Years

When Can My Baby Start Using the 2-24M Size?

You can transition to our sleep sack around 2 months old, or whenever your baby starts breaking out of swaddles. The minimum recommended weight is 10 lbs (4.5 kg). Thanks to adjustable underarm snaps, one sleep sack fits from approximately 2 months through 2 years—offering exceptional value and reducing waste.

How Do the Underarm Snaps Work?

The adjustable underarm snaps are a safety feature designed to keep the sleep sack fitting properly around your baby's upper body, preventing it from riding up near their face. Typically, you'll use these snaps for babies up to 6 months old, though smaller babies may need them longer. Always ensure a snug (but comfortable) fit around the chest.

Should I Buy More Than One?

Yes, we recommend owning two sleep sacks. This gives you a backup when one is in the wash, lets you keep one at grandparents' house, or provides a quick change option during nighttime accidents. Having a spare means uninterrupted sleep routines.

Won't Wool Feel Itchy or Scratchy?

Not at all. We exclusively use superfine Australian merino wool, which feels incredibly soft—almost silky—against your baby's delicate skin. This isn't your grandmother's scratchy wool sweater. In fact, merino's natural breathability and gentleness make it ideal for babies with sensitive skin conditions like eczema or heat rash.

Is Merino Wool Too Hot for Summer?

Surprisingly, no. While it sounds counterintuitive, merino wool actually helps keep babies cool in warm weather. The fibers create a natural micro-climate around your baby's body—releasing heat when they're warm and providing insulation when they're cool. For warmer nights, simply dress your baby in lighter layers underneath. The wool does the temperature-balancing work automatically.

Room temperature range: 63-75°F (17-24°C)

What Should My Baby Wear Underneath?

We recommend natural, breathable fabrics like cotton or merino wool pajamas. The amount of layering depends on your nursery temperature—check the dressing guide included with your sleep sack (also printed on the back of the room thermometer). As room temperature fluctuates throughout the night, the merino fibers automatically adjust to keep your baby comfortable.

How Can I Tell If My Baby Is Too Hot or Cold?

Touch your baby's tummy or the back of their neck—these areas give accurate readings of body temperature. Don't rely on checking hands and feet, as babies naturally have cooler extremities due to their developing circulatory systems. This doesn't mean they're cold overall.

Why No Sleeves? Won't Baby's Arms Get Cold?

The sleeveless design promotes healthy air circulation around your baby's chest, which is important for temperature regulation and safe sleep. Think about it: even adults rarely keep their arms under blankets all night. Babies are the same. Cold hands and feet are normal due to developing circulation and don't indicate that baby is uncomfortable. Layer appropriately underneath, and the merino wool will maintain core body temperature.

Do I Need to Wash Before First Use?

Pre-washing isn't required, though you're welcome to if you prefer. When you do wash it, please follow our care instructions carefully to maintain the merino wool's natural properties.

Why Does Wool Smell When Wet?

You might notice a distinct odor when merino wool gets wet—sometimes described as "wet dog" or "earthy." This is completely normal and actually a good sign. It means we use minimally processed natural merino wool that retains its lanolin content.

What is lanolin? It's the natural oil in sheep's wool responsible for merino's amazing properties:

• Moisture-wicking
• Stain resistance
• Soft texture
• Natural elasticity
• Antibacterial and odor-resistant when dry

Because lanolin content varies naturally between wool batches, one sleep sack may have a stronger smell than another. The smell completely disappears when dry and becomes less noticeable over time as lanolin gradually washes out.

How Do I Care for My Sleep Sack?

Good news: merino wool is naturally self-cleaning and doesn't require frequent washing like synthetic fabrics. To keep it fresh between washes, simply air it out regularly.

Washing instructions:

1. Close all zippers and snaps
2. Machine wash on gentle/delicate cycle: Maximum 85°F / 30°C
3. Use wool-specific or mild detergent (no bleach)
4. Air dry flat or tumble dry on No Heat / Air Dry setting only

Important: Never use high heat, as it can damage the wool fibers.

How Do I Remove Stains?

Act fast—treat stains immediately before they set. Never apply heat to wool stains, as this makes them permanent.

Method 1 (Recommended):

1. Rinse stain thoroughly with cold water
2. Mix liquid laundry detergent + a few drops of white vinegar
3. Apply mixture to stain and let sit for at least 1 hour
4. Gently blot with clean cloth
5. Rinse with cold water and repeat if needed

Method 2:

1. Mix 1 tsp dish soap + 2 tsp hydrogen peroxide (3%)
2. Apply to stain and let sit several hours
3. Wash as usual following care instructions

Always check the care label before washing. Following these guidelines will extend the life of your sleep sack significantly.

What Makes Your Sleep Sacks Different?

Our sleep sacks combine smart design features with premium natural materials:

✓ Adjustable underarm snaps - Grows with baby, reducing waste

✓ Safety belt openings - Use in car seats, strollers, and high chairs

✓ Two-way YKK zipper - Easy midnight diaper changes

✓ 100% organic cotton outer - GOTS certified

✓ 100% Australian merino wool inner - Temperature-regulating

✓ All safety certifications - OEKO-TEX, Woolmark, RWS certified

One sleep sack. Every season. Years of use. Peace of mind.