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How to Swaddle with a Muslin: A Step-by-Step Guide for New Parents
Learning how to swaddle with a muslin is one of those newborn skills that feels awkward the first few times and then suddenly clicks. Once it does, it becomes one of the most useful tools you have for settling a baby. This step-by-step guide walks you through the technique clearly, with the safety points you need to know.
Why Muslin Is the Best Fabric for Swaddling
Muslin’s open weave makes it naturally breathable — it allows air to circulate around your baby’s skin, reducing the risk of overheating. It has just enough stretch to wrap snugly without restricting circulation, and it’s lightweight enough not to add unnecessary bulk. The NHS and The Lullaby Trust both recommend breathable fabrics for newborn sleep, and muslin is consistently at the top of that list.
For swaddling specifically, you need a large muslin swaddle of at least 120x120cm. A standard muslin square (70x70cm) is too small — the wrap will come loose during sleep.
What You Need
- A large muslin swaddle — minimum 120x120cm
- A flat, firm surface (changing mat or mattress)
- A calm baby — ideally drowsy
Step-by-Step: How to Swaddle with a Muslin
Step 1 — Lay the muslin in a diamond shape
Place the muslin flat on your surface with one corner pointing toward you, one away, and one on each side. Fold the top corner down about 15–20cm to create a straight edge. This folded edge is where your baby’s neck will rest.
Step 2 — Position your baby
Lay your baby face-up on the muslin. Their neck should rest on the folded edge, with their shoulders just below it. The swaddle should never come up over the chin or face — if it does, reposition lower.
Step 3 — Bring the left side across
Take the left corner and bring it firmly across your baby’s body, tucking it snugly underneath their right side. The left arm should be held down against the body — comfortable but secure.
Hip check: Before continuing, make sure the fabric around the hips is loose. The legs should be able to bend into a natural frog-leg position. Never wrap the hips tightly — this can cause hip dysplasia over time.
Step 4 — Fold up the bottom
Take the bottom corner and fold it up over your baby’s legs and feet, tucking it into the chest area of the swaddle. There should be plenty of room for the legs to move freely — think sleeping bag, not tight bandage.
Step 5 — Bring the right side across
Take the right corner and wrap it across your baby’s body, tucking the end in securely behind their back. The swaddle should feel firm but not tight.
Step 6 — The two-finger test
Slide two fingers between the swaddle and your baby’s chest. If they fit easily, the tightness is correct. Too tight and you can’t fit them — loosen it. Too much space and the swaddle may come undone — rewrap more snugly.
Step 7 — Place baby on their back
Always place a swaddled baby flat on their back on a firm sleep surface. Never on their front or side.
Common Swaddling Mistakes
- Using a muslin square — too small, will come loose. Always use 120x120cm minimum.
- Wrapping the hips too tightly — legs must be able to move freely in a bent position.
- Swaddle too high — should sit at shoulder level, never near the chin or face.
- Continuing after rolling starts — once baby shows any sign of rolling (usually 2–4 months), stop swaddling immediately.
- Swaddling a baby with a fever — skip the swaddle when baby is unwell.
How Tight Should the Swaddle Be?
The rule is: snug on top, loose on the bottom.
- Arms and chest: firm but not rigid
- Hips and legs: loose, free to move
- Two-finger test at the chest: passes easily
- Top of swaddle: at shoulder level only
When to Stop Swaddling
Most babies are ready to transition out of swaddling between 2 and 4 months. The clearest signal is any sign of rolling — rocking from side to side, pushing up on one arm. Don’t wait for a full roll. A swaddled baby who rolls onto their front cannot push themselves back up, which is a serious safety risk.
The transition can be gradual — one arm free for a week, then both. A sleep comforter can help by giving baby something familiar to hold as they adjust.
Shop Deux Lapins Muslin Swaddles
Our muslin swaddles are 120x120cm, made from 100% OEKO-TEX certified cotton, and sized generously enough to get a proper, secure wrap every time.
Sources: The Lullaby Trust (UK) · NHS Baby Sleep Safety · International Hip Dysplasia Institute