You’ll have the most fabulous infant in the neighborhood with this no-sew mermaid baby costume! With inexpensive HeatNBond adhesive and your favorite pair of scissors—your little princess will be ready for a magical night under the sea!
This Halloween costume couldn’t be easier to make—break out your felt stash then prepare some simple shapes—you’ll iron-on your baby’s nighttime debut in no time at all.
You can make this costume as simple or elaborate as you like. It’s just a matter of cutting and pasting and of course, the magic of our go-to adhesive—Therm-O-Web HeatNBond!
We used onesies sized 6–9 months, but the beauty of this craft is that you can adjust the pieces to fit any size!
- onesies (we used size 6–9 months)
- 1 – 12″ x 15.5″ piece stiff green felt
- ink pen or marker
- assorted shades of green, white and pink felt scraps
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- fabric scissors
- hot glue gun and hot glue
- rhinestone embellishments, if desired
- Place stiff green felt on top of onesie then freehand a fish-shaped tail using ink pen or marker. The freehand method will make the shape look more realistic. Cut out tail shape using fabric scissors then set aside.
- Cut half-circle ‘gills’ out of assorted shades of the green felt scrap fabric, as needed.
- Trim a piece of ribbon the width of the onesie waist then set aside.
- Preheat iron to medium heat, no steam. Place adhesive on back of the fish tail to be bonded—paper liner should face up. Press and hold iron on paper liner for a few seconds then allow it to cool.
- Trim off excess paper then peel off backing. Place material adhesive side down, to attach fish tail shape on onesie. Press and hold iron approximately 8 seconds on each section, one at a time, until all the pieces have bonded. Repeat with dark green strip of felt at the waist, then flip onesie over and repeat with the green leaves.
- Set onesie aside to cool. Meanwhile, trim various circles, about the size of a nickel to the size of a quarter, from the pieces of white and pink scrap felt to make a pearl necklace then set aside.
- Next, layer ‘gills’ on fish tail then secure in place using a glue gun and hot glue. Once the ‘gills’ are in place, hot glue the ribbon waistband to the onesie to hide the seam of the fish tail.
- Hot glue pearl necklace around the collar of the onesie, then set aside to let the components cool and dry—that’s all there is to it!