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Is your baby ready to be a trendy hipster, geeky nerd, or chic prep? Choose your baby’s style with the new cardigan onesie. Just take a long-sleeved onesie make a couple of snips and additions, and it’s a whole new style.
I have updated and simplified this tutorial! You can see the new cardigan onesie tutorial and a baby girl wearing a cardigan onesie!
Baby Cardigan Onesie Tutorial

There are lots of fun details about this cardigan even though it’s fairly simple to make.

Baby Cardigan Onesie Tutorial
It can be worn with or without pants. Or a skirt for girls. It would be fun paired with a collared shirt, suspenders, and a bow tie.
Baby Cardigan Onesie Tutorial
Update: I’ve had a lot of people have problems with the knit band or ask questions about it. The reason you multiply by .75 is so that the band does not gap. When you cut the onesie and then sew a seam, it will stretch. By using a slightly smaller band, it will counter the stretching out and make it lay nicely. You could also use .85 if you’re more comfortable with that. Also, use RIBBING to make your life a lot easier. Ribbing stretches well and doesn’t shrink. Supplies

Long or short sleeved onesie- (I think the short sleeved ones look best on girls.)
RIBBING (make your life easier by using ribbing and not regular knit!)
Buttons
1. If your onesie has crossover shoulders, find where the crossover lays flat and pin two layers together.
2. Either zigzag or double needle the two layers together.
Baby Cardigan Onesie Tutorial
3. Measure across the front of the onesie and mark the center all the way down. At the bottom slant to one side between two of the snaps.
Baby Cardigan Onesie Tutorial
4. Cut on the line.
5. Draw from shoulders to parallel with the armpits.
6. Cut on lines up around the neckline so that you cut off the neck band.
Baby Cardigan Onesie Tutorial
*This is perfect if there’s a small picture, phrase, or stain near the neckline that you want to get rid of.
Baby Cardigan Onesie Tutorial
7. Measure the whole cut edge. Take the measurement and multiply by .75. Add 1/4″ seam allowance. This is the length of the front band. I wanted my band to be 3/4″ tall, so double that amount and add 1/4″ seam allowance. Make sure the stretch goes with the long sides.
8. Sew ends at 1/4″.
9. Turn right side out and poke out corners.
Baby Cardigan Onesie Tutorial
10. Find the center of the band and then the center of each side, so you divide the band into four sections. Use the same method to divide the cut edge of the onesie into four sections. Match pins.
Baby Cardigan Onesie Tutorial
12. Stretch each section and pin so the excess is distributed evenly.
13. Stretch while zigzagging at 1/4″.
Baby Cardigan Onesie Tutorial
14. Zigzag the edges of the snap facing to prevent fraying.
Baby Cardigan Onesie Tutorial
15. With your machine set on to a straight stitch, stretch and sew the seam allowance towards the onesie. Sew at 1/8″. Careful when going over the shoulders.
Baby Cardigan Onesie Tutorial
16. Snap the snaps together overlapping the two sides.
17. Pin the two layers together and sew together.
Baby Cardigan Onesie Tutorial
18. Pin two layers of the front band together at three or four places. Sew buttons on at each pin.
Baby Cardigan Onesie Tutorial
19. Cut off sleeve hems. Measure length.
20. Take the measurement and multiply by .75. Add 1/4″ seam allowance. Use the same height as the front band.
21. Sew short edges to make a tube. Fold in half with right sides out.
Baby Cardigan Onesie Tutorial
22. Sew band to each sleeve end at 1/4″ stretching to fit.
23. With a straight stitch, stretch and sew the seam allowance towards the sleeve at 1/8″.
Baby Cardigan Onesie Tutorial
These baby boys are off to college in their new cardigan onesies.
Baby Cardigan Onesie Tutorial
You can play a pick up game of soccer
Baby Cardigan Onesie Tutorial
or just have some laughs with your friend.
Baby Cardigan Onesie Tutorial

Author: Heather