You’ve chosen the perfect baby sleep sack — soft, breathable, and safe. But there’s one big question left:
What should your baby wear underneath it?Getting the layers right is just as important as the sleep sack itself. Overdressing can lead to overheating, while underdressing might wake your baby from the chill.In this guide, we’ll walk you through:
- What to wear under a 0.5 TOG sleep sack
- How to dress for different room temperatures
- Which SwaddleAn essentials are perfect for layering
Want to understand TOG, safe sleep, and how to choose the best sleep sack overall? Don’t miss our full Baby Sleep Bag Guide for expert insights.
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Understanding the Role of Layers
TOG ratings help you understand the insulation of a sleep sack—but it’s the combination of TOG and clothing layers that creates safe, cozy sleep.SwaddleAn’s signature baby sleep bag is rated 0.5 TOG — ideal for warmer weather or rooms between 21–25°C (70–77°F). Here's how to dress your baby under it based on your environment.
What to Wear Under a 0.5 TOG Sleep Sack (By Room Temperature)
Warm Room (75–80°F / 24–27°C)
Your baby doesn’t need much—keep it minimal and breathable.
- Recommended: Short-sleeve or sleeveless bodysuit
- Try: SwaddleAn Baby Bodysuit – soft, stretchy, tag-free
- Avoid: Long sleeves or footies
Mild Room (70–74°F / 21–23°C)
This is the most common range — ideal for a 0.5 TOG sack.
- Recommended: Convertible Footie or Long-Sleeve Bodysuit
- Try: SwaddleAn Convertible Footie – snug fit, foldable cuffs and feet
- Or: SwaddleAn Long Sleeve Pajamas – breathable bamboo softness
Cooler Room (66–70°F / 19–21°C)
Add gentle warmth without bulk.
- Recommended: Long Sleeve Pajamas + optional socks or lightweight cap
- Try: SwaddleAn Long Sleeve Pajamas paired with Knotted Cap if needed
- Tip: Monitor baby's neck or back — if sweaty, remove a layer
Nap vs. Night: Should I Dress Differently?
- Naps: Can usually be lighter if the baby naps in a warmer, sunlit room
- Night: Rooms often cool down, so you may need full-length pajamas or snug footies
Still wondering about naps? Read our article: Should You Use a Baby Sleep Sack During Naps?
Special Considerations for Newborns
- For newborns, a bodysuit and optional cap under the sleep sack often works well
- If your baby isn't ready for a sleep sack, start with a Swaddle Blanket
- Follow the general rule: one more layer than you'd wear in the same room
Helpful Extras from SwaddleAn
- Knotted Cap – for cooler naps or newborns
- Crib Sheet – soft, fitted, and safe
- Premium Bibs – helpful for teething babies during naps
- Premium Burp Cloth – protective for newborn spit-ups
- Luxury Bamboo Blanket – not for crib use, but perfect for stroller naps (12 months+)
Final Thoughts: Dress Smart, Sleep Safe
What goes under a sleep sack matters just as much as the sack itself. Whether it’s a summer afternoon nap or a cool nighttime sleep, layering correctly helps your baby stay comfortable, safe, and deeply rested.SwaddleAn offers everything you need to build the perfect sleep wardrobe — from breathable sleep sacks to soft, sensory-friendly layers underneath. All made with intention. All wrapped in love.Explore the SwaddleAn sleepwear collection and dress your baby with comfort and care at every layer.
