How to Sew a Baby Sleep Sack


Does anyone know what happens 14 days from today? If you aren’t sure, let me enlighten you. COLLEGE FOOTBALL kicks and Auburn begins it’s quest for a much better football season. Baby girl has no idea what she is getting into or her parents love/obsession with college football and the Auburn Tigers. After finding out I was pregnant we told some of our family her due date to which my uncle replied, you know that is the Alabama vs. LSU weekend? Yes, we know….we’ll see what we can do :o)


So it shouldn’t be much of a surprise that one of my first projects for little one shows hints of orange and blue! She will be quite small for this season, so I decided an embellished onsie would be the way to go! I’ve seen them called everything from a sleep sack/gown to a baby maxi dress. But for our baby girl it’s her first Auburn cheerleading outfit.  It was pretty simple to put together, so let me share with you how to sew a baby sleep sack.

 Now, what you will need will vary a little based on the size of the onsie you are using. These direction are for a 0-3 months size, so you’ll have to add a little here and there if you are making one for a larger size. (Also if you would like to see the directions in full without pictures you can scroll down to the bottom). 

Supplies: 3/4 – 1 yard of main fabric, 1/4 yard of ruffle fabric, ribbon or elastic, thread, sewing machine, onsie, scissors


Step 1: Create a pattern using the onsie as a guide. You are going to want to use the width to be about half an inch wider than the width under the arms. I taped two pieces of paper together to trace mine, and I’ve included the measurements so you can see about what size it needs to be. 


Step 2: Fold your fabric in half and pin your pattern on top. Cut out your fabric. 


Step 3: I don’t have a picture of this step, but at the top of each piece fold over a 1/4 of an inch and hem.

Step 4: With right sides together stitch each of the long sides from top to about an inch from the bottom. You want to make sure you STOP about an inch from the bottom to leave room for adding the ribbon or elastic.


Step 5: Now we are going to work with the inch hanging out at the bottom. Fold the bottom up to where the stitching stopped and iron. Now stitch along the top (the frayed part), leaving the little openings on each side. 


Step 6: Slide the onsie onto the sack bottom. Match up the seams and pin in place.


Step 7: Stitch the sack onto the onsie. Now this might seem silly, but make sure you open up the bottom of the sack, unbutton the bottom, and slide that onto your sewing machine to reach where to sew. 


Step 8: Now you can thread the ribbon or elastic through the bottom of the sack/gown. 


Step 9: Now it’s time to create the ruffle. Measure the length around the top of the sack. The measurement of your fabric will be 4 inches x double the length of the sleep sack. 

Step 10: Fold in half with right sides together and stitch closed. Then turn right side out & iron flat. 


Step 11: Using a basting stitch (set your sewing machine to the longest stitch and lowest tension) sew  right down the middle. Do not back stitch.


Step 12: Now create your ruffle by pulling on the bottom thread of your stitch slowly gathering the fabric.

Step 13: Pin the ruffle in place, lining up the center stitch with the stitch line on the onsie. Sew in the same fashion as when you attached the sack.


Now a few other options….you could definitely get this baby monogrammed! Also if you used a more “flexible” fabric like t-shirt material it might have a little more give and comfort to baby. Please let me know if you have any questions. I’m not a professional sewer in any sense of the imagination, but I’ll try my best to help! 


 Here is a link to a printable PDF of  instructions for how to sew a sleep sack (no pictures).

I can’t wait for football and our baby girl to arrive!! WAR EAGLE everyone. Have a great weekend!


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