Free pattern description:

A head circumference of my 2,5 years old girl is 48cm.
The size of finished hat: 21cm width, 17cm height.
The yarn I’ve used is 100% Cotton DK by Patons UK (210m/100g) in Nectarine color.
And a 4mm hook.

Ch 4 join in ring with a slip st
Rnd 1: 12 DC in the ring
Rnd 2: 2 DC in each st around
Rnd 3: (DC, ch 1, DC) - in every 2nd st around
Rnd 4: 4 DC in each ch-1-space around
Rnd 5: Cluster(2 DC, ch 1, 2 DC) - in the middle of each 4-DC-cluster
Rnd 6: (2 DC, ch 1, 2 DC) - in ch-1-space, 1 Treble in the space between the clusters, repeat from around
Rnd 7: (2 DC, ch 1, 2 DC) - in ch-1-space, 2 DC in Treble - repeat from around (84 st)
Rnd 8: (2 DC, ch 1, 2 DC) - in ch-1-space, 1 DC in each of next 2 DC between the clusters - repeat from around
Rnd 9-16: As Rnd 8
Rnd 17: Sc in each st around(84 st)
Rnd 18: 6 Sc, ch-3-Picot - repeat from around. Fasten off, hide the ends, attach a lovely flower and enjoy you girl’s new hat!

How I do a Picot: Sc, ch 3, slip st in the sc (insert hook through front loop of sc and left vertical bar of the same sc).

Variations: http://www.ravelry.com/projects/LBK63/summer-hat