I have recently crocheted this little sun hat for my 2 year old granddaughter and a second hat to fit my 7 year old granddaughter. The pattern is free on the Hobbycraft website under the Ideas section. Its available to make in three sizes: Adult, Children, Toddler.
The crochet instructions are by: sewing_the_seeds_of_love.
You will need Knitcraft 'Its Only Natural' DK yarn. It's 100% organic cotton yarn.
They are very quick to make, it probably took me a couple of nights to complete each hat and they look very cute.