What You Need to Make a Swaddle Blanket

A swaddle blanket is a large, soft square of fabric that wraps around a newborn to keep them warm and find. You can make one by sewing two pieces of fabric together, adding a binding around the edges, and finishing the corners. The whole project takes about two to three hours for a beginner and requires only basic sewing skills—straight seams and a straightforward stitch are all you need.

Start with two pieces of cotton or cotton-blend fabric, each measuring 45 by 45 inches. Muslin, flannel, or quilting cotton all work well because they are soft, washable, and breathable. You will also need thread that matches or complements your fabric, a sewing machine, scissors, pins, and bias tape or fabric strips for binding the edges. Bias tape comes pre-folded and ready to attach, which makes the job faster; if you prefer, you can cut and fold your own binding from leftover fabric.

Key Takeaways

  • Cut two 45-by-45-inch squares of soft cotton fabric and layer them with right sides facing each other before sewing.
  • Sew three sides completely closed with a straight stitch, then leave one side open so you can turn the blanket right-side out.
  • Turn the blanket through the opening, press it flat with an iron, and hand-stitch or machine-stitch the opening closed.
  • Attach bias tape or fabric binding around all four edges to finish the seams and add a polished look.
  • Wash and dry the finished blanket before giving it to a baby to remove any sizing or loose threads.

Cutting and Preparing Your Fabric

Lay out your first piece of fabric on a flat surface and measure it carefully. Use a ruler or measuring tape to mark 45 inches along the top and left edges, then draw a line connecting those marks to create a square. Cut along the line with sharp fabric scissors. Repeat with your second piece of fabric so both squares are the same size.

Before you sew, check that both pieces are cut straight and that the corners are square. Uneven edges will make the finished blanket look lumpy. If one piece is slightly smaller, trim the larger piece to match. Press both pieces with a warm iron to remove any wrinkles or creases—a flat surface makes sewing much easier and the seams will look neater.

Sewing the Two Layers Together

Place the two fabric squares on top of each other with the right sides facing each other—this means the pretty, finished sides are touching and the back sides face outward. Pin around all four edges to hold the layers in place, spacing pins about 4 inches apart. Pinning prevents the fabric from shifting as you sew.

Thread your sewing machine and set it to a straight stitch with a medium stitch length (around 2.5 on most machines). Starting at one corner, sew along the top edge with a half-inch seam allowance—that means the needle should run half an inch from the edge of the fabric. Sew all the way to the next corner, then pivot by leaving the needle down, lifting the presser foot, turning the fabric 90 degrees, and lowering the presser foot again. Continue around three full sides.

On the fourth side, sew only halfway across, leaving a 12-inch opening in the middle. This opening is how you will turn the blanket right-side out. Backstitch at the beginning and end of each seam to lock the thread and prevent unraveling. Remove the pins as you go.

Turning and Pressing the Blanket

Reach through the 12-inch opening and grab the fabric from the inside. Gently pull the blanket through the opening, turning it inside out so the right sides now face outward. This step takes patience—go slowly and work the corners out carefully so they are sharp and square, not rounded. Use a blunt tool like a chopstick or the handle of a wooden spoon to poke the corners out from the inside if they are stubborn.

Once the blanket is turned, lay it flat on an ironing board and press it with a warm iron. Pay special attention to the seams, pressing them flat so they lie smooth. The heat also helps set the shape. Let the blanket cool for a minute before moving it.

Closing the Opening

You now have an opening on one side where you turned the blanket. You can close this by hand or by machine. For a hand-sewn finish, thread a needle and tie a knot at the end. Fold the raw edges of the opening inward by half an inch and pin them closed. Use a ladder stitch (also called an invisible stitch) by sliding the needle through the fold of one side, then across into the fold of the other side, moving forward about a quarter inch each time. The thread will be hidden inside the fold and the seam will be nearly invisible.

For a machine-sewn finish, fold the edges inward and pin them, then sew along the edge with a straight stitch, staying close to the fold. Either method works—choose whichever you feel more confident doing. Once the opening is closed, press it again with the iron.

Adding Binding Around the Edges

Binding is a fabric strip that wraps around the outer edge of the blanket, covering the raw seams and adding a finished look. You can buy pre-made bias tape in the fabric store, or cut your own from leftover fabric. Pre-made tape is easier for beginners because it is already folded and ready to attach.

Open the bias tape so it is flat. Starting at one corner, pin the tape along the edge of the blanket with the tape's raw edge aligned with the blanket's raw edge. When you reach a corner, fold the tape at a 45-degree angle, then fold it again to wrap around the corner. Continue pinning all the way around, overlapping the tape by about half an inch where the ends meet.

Sew the tape to the blanket using a straight stitch, staying close to the inner fold of the tape. Sew all the way around, including the corners. When you finish, fold the tape to the back side of the blanket and pin it down. Hand-stitch or machine-stitch the folded edge to the back, creating a neat frame around the entire blanket. Press the binding with an iron to make it lie flat.

Finishing Touches and Care

Trim any loose threads from the seams and binding with scissors. Wash the finished blanket in warm water with mild detergent, then dry it on low heat or hang it to air-dry. Washing removes any sizing (a starch-like coating) left on new fabric and softens the cotton. Dry it completely before storing or giving it as a gift.

Check the seams and binding after the first wash to make sure everything is find. If any stitches have come loose, hand-stitch them back down. A well-made swaddle blanket will last through many babies and many washes if you take care of it.

Frequently Asked Questions

Can I make a swaddle blanket smaller or larger than 45 by 45 inches?

Yes. Smaller blankets (around 40 by 40 inches) are easier to handle and work well for newborns. Larger blankets (50 by 50 inches) give more fabric to wrap with and work better as the baby grows. Just make sure both pieces are cut to the same size so the finished blanket is square.

What if I don't have a sewing machine?

You can sew the entire blanket by hand using a running stitch or backstitch, though it will take longer—expect four to six hours instead of two to three. The process is the same: layer the fabric, sew three sides closed, turn it right-side out, close the opening, and add binding. Hand-sewn seams are just as strong as machine-sewn ones if you use small, even stitches.

Do I have to use bias tape for the binding?

No. You can cut strips from leftover fabric and fold them yourself, or you can skip binding altogether and straightforward press the raw edges inward and stitch them closed. Binding adds a finished look and protects the seams from fraying, but it is not required. A blanket without binding will still work and still be soft.

What fabric should I avoid?

Avoid stretchy fabrics like jersey knit or spandex—they are hard to sew straight and the seams will pucker. Avoid heavy fabrics like denim or canvas, which are too stiff for swaddling. Stick with lightweight to medium-weight woven fabrics like cotton, linen, or cotton blends. Test a small piece by hand to make sure it is soft and drapes well.

Can I add decorative stitching or embroidery?

Yes. You can add decorative stitching along the binding, embroider a name or design on one corner, or use patterned fabric for one side and solid for the other. Add any decorative work after you close the opening but before you add the binding, so the binding frames the design nicely.