To build on Julie's post...
I couldn't find the Sweet Pea yarn either - but here is a list of yarn from the Cleckheaton website. I couldn't find a yarn that looked anything like the one in the baby hat. It looks like you can contact them through the website for international stores that might sell this product.
I couldn't find any encore with colorspa as the name, but here is a site that has colorspun. There is a link for to view colors. Granted the pictures aren't very big but it might give you a better idea.
Here is a link to all the Encore yarns.
Hopefully this helps a little!