This pattern is for adult headbands, but can be adjusted for child sizes by reducing the number in the foundation chain and adjusting the number of rounds,

Stitches used:
Foundation hdc,
Hdc into third loop (from behind)
Slip stitch.

I can make three adult headbands from one skien of facets yarn.

You will need loops and threads facets yarn, or another similar bulky weight yarn (5 weight)

I used a 6.00 mm hook