Cut a rectangle large enough for your child from the white felt. Round the top corners. Cut slits in the top corners large enough for your black buttons to fit through. (Note: It is not necessary to hem the edges, as felt will not fray.)
Sew the black buttons to the front of the shoulders of footie. Attach cape.
For the zipper detail:
With your needle and thread, tack the top of the white zipper to the snap flap at the top of the garment. Then tack the bottom to the left of the garment’s zipper. (This assembly allows the garment’s zipper to remain functional.)
For the belt:
Cut a circle “buckle” from your gold glitter foam. Cut a length of thick black ribbon long enough to tie around your child’s waist. Hot glue the gold glitter foam circle to the center of your ribbon.
Tie the belt around the outside of footie with a bow in the back.
For the final touch:
Complete with baby mittens and baby socks in red for superhero “gloves” and “boots.”
Turn this costume into any baby superhero by customizing the colors and details!