“I Solemnly Swear” Harry Potter Onesie

The full tutorial for making these adorable Harry Potter onesies is below, but if don’t want to make one yourself, I’ll make one for you! You can find these Harry Potter baby onesies in my shop!

We’re getting close to the final stretch before this baby is born, and I feel totally unprepared! We still haven’t set up a nursery for her (truthfully, I’m still using the room as my craft room until this garage remodel project is finished and I can move my crafting stuff into that new space), but I’m slowly making headway on the important things, like bottles, a bassinet, and clothing. I made one more super cute onesie this weekend to add to her stash, because what sort of Harry Potter nerd would I be if my baby didn’t have a Harry Potter Onesie?!

Super cute Harry Potter onesie! Make your own using this tutorial, or find them in her Etsy shop!

If you’ve never done this before, I have a super detailed tutorial here on how to use heat transfer vinyl, so I suggest you read up on that before getting started. But don’t worry, it’s really easy to use and once you get the hang of it there are tons of things you can make using heat transfer vinyl! Check out my heat transfer vinyl gallery page for inspiration if you want more ideas!

If you’d rather have me make you one of these snazzy onesies, I sell them in my shop!

If you like this onesie, check out some of the other adorable baby onesie tutorials on this site!

“I Solemnly Swear That I Am Up To No Good” Harry Potter Onesie

Here’s what you need for this project:


Start by designing your onesie in your design software. Once you have the design looking the way you want it, remember to mirror the image and then send it to your cutting machine.

Weed away any extra heat transfer material, leaving only the pieces you want to show on your finished onesie.

Flip the design over so that the plastic backing is on top and the words read correctly from left to right, and position it on your onesie.

Place the clean hand towel over the design and press down with a hot iron for 30-45 seconds. Remove the iron and carefully peel away the plastic backing, and you’re done!

You have a super cute “I Solemnly Swear” Harry Potter onesie!

Super cute Harry Potter onesie! Make your own using this tutorial, or find them in her Etsy shop!

Want to share this tutorial with your friends? Just click any of the share buttons on the left to share with Facebook, Pinterest, Twitter, etc.!

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Jessi Wohlwend

I believe that anyone can do crafts and DIY projects, regardless of skill or experience. I love sharing simple craft ideas, step by step DIY project tutorials, cleaning hacks, and other tips and tricks all with one goal in mind: giving you the tools you need to “do it yourself”, complete fun projects, and make awesome things!

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Reader Interactions

  1. Sam @ DIY Just Cuz says

    5 years ago

    So cute, as usual! I love everyone’s quirky little onesies…I’m sure you can’t wait for your little one to enter the world…I feel you, my first daughter is only 8 weeks now and I’m still thinking to myself, I’m not even prepared now!!! Will be pinning this beaut!

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