This pattern is as simple as it gets but it's such a sweet, little and most of all free pattern so I decided to write a review anyways
It's the Zaaberry baby hat tutorial and pattern, which you can find here: http://zaaberry.blogspot.nl/2012/08/baby-hats-tutorial-and-pattern.html
The pattern is for 0-3 months old babies, but since it probably will be to warm in the Netherlands for a hat in 3 months time, I added 1.5 cm to the sides to accomodate for a baby which is a little bit bigger.
I made the simplest version, there is also a tutorial for a hat with a knot and with ears. It's made with scrapes of fabric from another project, so it could be nice for anyone who has a bunch of scraps leftover and wants to do something cute with it.
It was made for a babyshower, and I had fun making it!