This pattern makes a child size for ages ~2-4 years. You can adapt for 4-12 easily by using a hook that’s half a mm bigger for the hat base.

Instructions include a video tutorial for the hat assembly.

Materials:

• 4 mm crochet hook
• Worsted weight yarn of your choice
• Tapestry needle
• A small amount of stuffing / batting

Stitches:
ch - chain
sl st - slip stitch
sc - single crochet
sc2tog - single crochet 2 stitches together (decrease)
sc3tog - single crochet 3 stitches together
hdc - half double crochet
dc - double crochet
tr - treble (triple) crochet
dtr - double treble (triple) crochet
magic loop/magic ring