Sew a Baby Bodysuit With This Beginner-Friendly Step-By-Step Photo Tutorial and Video. Free Sewing Pattern in 9 Different Sizes.
I’ve always loved sewing bodysuits for my babies, and now I’m sharing my tried and true pattern with you!
I teamed up with JOANN to bring you this tutorial and help you find all of the supplies you'll need for this project. JOANN is my one-stop-shop for all of my sewing needs.
This is a sponsored post on behalf of JOANN. All thoughts and opinions are my own.
If you’ve followed Sweet Red Poppy for a while, then it comes as no surprise that I love sewing for babies!
I had three babies in under three years and being on a tight budget with little ones meant looking for any opportunity to save money.
I sewed 90% of my babies' clothes and one of the things I loved the very most was making bodysuits! Every afternoon, I'd put all three babies down for naps and sew uninterrupted for an hour.
(I'll be sharing the sleep gown version pictured below soon) Enjoy this throwback photo of Vivi in a handmade onesie and Top Knot Hat.
I’m sharing a step-by-step tutorial today to help you make your own baby onesie out of knit fabric.
Baby Bodysuit Sizes
My free baby bodysuit sewing pattern includes the following sizes.
- 3-6 Month
- 6-9 Month
- 9-12 Month
- 12-18 Month
- 18-24 Month
- 2 Years
Looking for even more free baby sewing patterns? Be sure to check out the posts listed below!
- Free Leggings Pattern
- Free Top Knot Baby Hat
- Free Baby Bandana Bib Pattern
- Free Baby Burp Cloth Sewing Pattern
- All The Best Hair Bow Tutorials
Beginner-Friendly Baby Bodysuit Sewing Pattern
This download includes a professionally drafted, color-coded baby bodysuit sewing pattern in 9 different sizes.
Step-by-step detailed photos, detailed written instructions, and a video are also included.
Baby Bodysuit Pattern Includes
Included in this pattern is a professionally drafted and graded color-coded pattern. Use the 1x1 inch printing guide to ensure accuracy and quickly put this pattern together with its no-trim pieces.
For this pattern, I recommend using a medium-weight knit fabric with a content of 95% Cotton, 5% Lycra/Spandex. Having at least 5% Lycra or Spandex allows the fabric to have elasticity and bounce back to its original shape without getting stretched out over time.
To determine the stretch of your fabric simply stretch a 2-inch piece of the knit fabric in one direction and repeat this process in the opposite direction. Choose the direction of the greatest stretch to go around the head.
This sewing pattern uses a 3/8” seam allowance. Seam allowances are included in the sewing pattern.
When sewing this pattern you can use a variety of different techniques to finish the seams.
First, you can use the stretch stitch on your sewing machine. This looks like a lightning bolt and allows seams to have more give, so the stitches don’t pop when stretched out.
If you don't have this option, use a zig-zag stitch and narrow the width of the stitch.
The final option is to finish the seams with a serger. The serger creates a seam that is cut and finished in one step. This option creates a more professional-looking finish.
Choosing the Right Size
Make sure to take fresh measurements whenever you are sewing for a baby! Babies grow so quickly that they tend to outgrow sizes between measurements. For the very best fit, you'll want to use up-to-date measurements!
Table of Contents
Baby Bodysuit Sewing Supplies
- Knit Fabric (I'm using POP! fabric from Joann in this tutorial)
- Thermoweb Soft Stretch Lite
- Knit Interfacing
- Scissors or Rotary Cutter & Mat
- Pins or Clips
- Iron & Ironing Board
- Sewing Machine Needle
- Fabric Pen or Chalk
- Printing Paper
- Heavy Starch (for shifty knit fabrics)
Step #1: Download & Assemble the Baby Bodysuit Sewing Pattern
Download this baby pattern and print it out. There are three different sleeve options.
I’ll be sewing the short sleeve option in this tutorial.
*PRO TIP: I like to print off my pattern on cardstock so that it will last for multiple uses.
Download the pattern to your computer and print the pattern at 100% with no scaling.
Align the circles and black lines together as you are piecing the pattern together. You can connect the pieces of paper with tape or a glue stick.
Below is a photo of how the pattern pieces together.
Feel free to trim off the excess from each piece of the pattern or hold the pieces up to the light and align them together without trimming.
Once you reach a paper without any stars on the right-hand side you can move down and start a new row.
Once you have everything taped together, cut out your desired size.
You should have the following pieces.
- Front Bodysuit
- Back Bodysuit
- Sleeve (Short, Flutter, or Long)
- Hem Binding
- Front Neck Binding
- Back Neck Binding
- *Baby Bodysuit Armband (For Flutter Only)
Step #2: Cut out the Baby Bodysuit Pattern and Fabric
Your knit fabric should be washed and dried before you cut it out. This will help to preshrink the fabric and prevent the color from running.
Lay the pattern pieces on top of the fabric with the greatest amount of stretch going across (This is very important!) the pattern horizontally. Pin it in place and cut around the outside of the pattern.
*The bodysuit front and back need to be cut on the fold.
Make sure to transfer any marking from the shoulders on the front and back pattern pieces to the fabric.
Once you’ve cut out your fabric pieces, cut out your interfacing.
Step #3: Press Neck, Hem, and Arm Bands
There are four different bands that will need to be pressed to prepare them to be sewn to the bodysuit.
Pressing your bands before pinning them to the fabric gives your bodysuit a more professional-looking finish.
- Front Neck Binding
- Back Neck Binding
- Hem Binding x2
- *Armband x2 (for flutter sleeve option)
Fold the band in half longways, with wrong sides together, and press well with plenty of steam to set the crease.
*PRO TIP - If you’re working with a hard to manage fabric, spray it with heavy starch. This will make the fabric easier to manipulate.
Step #4: Attach Neck Binding to Front and Back Neckline
Mark the center of the bodysuit neckline and the center of the neck binding.
This will help you to evenly distribute the neck binding.
Lay the neck binding on top of the front baby bodysuit neckline with raw edges aligned.
Pin the neck binding and neckline together at the center marking.
Next, pin the neck binding to the edge of the neckline. The end of the neck binding should extend beyond the edge of the neckline.
Evenly distribute the fullness of the neckline between pins making sure not to stretch out the neckline.
Sew the neckline with a 3/8” seam allowance. If you are using a sewing machine, use a stretch stitch (this looks like a lightning bolt) or a narrow zig-zag stitch.
Press the binding upwards away from the neckline. Use plenty of steam to shrink the neck binding to it’s original size.
Topstitch 1/4” from the seam catching the neckline and neckband using a stretch, zig-zag stitch, or a straight stitch with the length increased.
Press the neckline.
Step #5: Join Front and Back Bodysuit Shoulders
Lay the front bodysuit out in front of you with with right side facing upward. Lay the back bodysuit on top overlapping the shoulders. Take care to line up the markings on each side. Pin the shoulders together along the edge of the fabric.
The edge of the neck binding will extend slightly beyond the shoulders on both sides.
Sew the shoulders together with a basting stitch.
Step #6: Sew the Bodysuit Sleeves
One of my favorite techniques for great-looking seams when sewing with knit fabric is using Thermoweb Soft Stretch Lite.
This step is optional, but it will give you a beautiful hem without any waviness.
To use Soft Stretch Lite you will need to apply it to the wrong side of the hem. I really like that it has a liner on one side because that allows the position of the hem tape to be more precise.
Iron the hem tape along the entire hem.
Fold the hem upwards along the edge of the adhesive and press with a hot iron to create a crease.
Once the fabric has cooled, peel back the liner from the hem tape. If you peel the liner away and see any residue on the liner the tape hasn’t had sufficient heat to fully adhere to the hem. Give it a bit more heat and try again.
With the hem folded upwards press again to adhere the fabrics together.
Stitch along the length of the sleeve to secure the hem.
Lay the bodysuit out in front of you with the right side facing up. Lay the sleeves out in front of you.
Fold the sleeve in half to find the center and mark it with a pin.
Pin the center of the sleeve to the marking from the previous step. Right sides should be facing together.
Pin along the entire armhole to secure the sleeve into place.
Sew the sleeve with a 3/8” seam allowance.
Press the sleeve seam allowance towards the sleeve and trim away any excess neck binding.
*Sewing Flutter Sleeves to Bodice
The photos for this step were taken from my Madeline dress pattern so the bodice will appear slightly different but it uses the same method of construction.
Flutter Sleeves - Sew two basting lines across the straight portion of each flutter sleeve. Gather to fit the armscye. *Flutter sleeves require the armbands.
Sewing Flutter Sleeves onto Bodice - Open the bodice so that the right side is facing upwards.
Take your flutter sleeve and place right sides together on the bodice. Match up the middle point of the sleeve to the front and back bodice seam. Align the edges of the flutter sleeve with the edge of the armscye. Pin in place.
Attach Armband - Attach the center of the armband to the shoulder seam and pin the entire length of the armscye. You should have 4 raw edges aligned.
Press flutter sleeve seam allowance towards the bodice. Top stitch 1/4" from the seam if desired.
Fold the bodysuit in half with the right sides together. Pin the sleeves together and the front and back of the bodysuit.
Sew along the sleeve and the side seams.
Trim any excess threads.
Step #7: Create the Snap Placket
Adhere the interfacing along the crotch of the bodysuit using the pattern markings as a guide. It should be placed 1/4" from the raw edge of the fabric.
Fold the raw edge upwards towards the interfacing. Fold the interfacing in half, the folded edge of the fabric should just barely cover the upper edge of the interfacing.
Press, pin the fabric in place and sew 1/8" from the edge of the folded fabric. Repeat with the other side.
Step #8 Sew the Leg Binding
Press the leg binding in half lengthwise with the wrong sides together. Use starch to help stabilize the knit fabric.
Next, fold the leg binding in half against the direction of the fold with right sides together. Pin the short ends together.
*This step will encase the raw edges.
Sew along the short raw edges 1/4" from the edge.
Turn the leg binding right side out and push the seam allowance inward to form a sharp corner.
Find the center of the leg opening on the bodysuit as well as the center of the leg binding.
Align the center of the leg binding with the center of the leg. Then align the finished edge of the leg binding with the finished edge of the snap placket.
The raw edges of the binding should be aligned with the raw edge of the leg opening. Be sure to evenly distribute the fullness by using plenty of pins. Gently stretch the leg binding to fit the leg opening.
Sew the binding with a 1/2" seam allowance.
fold the binding outward away from the bodysuit and press well.
You can trim down the snap placket seam allowance edge to remove some of the bulk where the seams allowances meet.
Topstitch the leg binding in place by sewing from the front of the bodysuit 1/8" from the seam.
Step #9: Install the Bodysuit Snaps
Install three snaps along the interfaced crotch following the directions of your snap packaging.
The cap and socked should be attached to the front of the bodysuit and the stud and socket should be placed on the back of the bodysuit.
Give your finished baby bodysuit a good pressing with plenty of steam and trim away any excess threads.
Don't forget to order or pick up all of the supplies for this tutorial from your local JOANN.
Don’t want to forget about this pattern? Save this project for later! Click here to save this project on Pinterest.
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