Pillow for 6 year old

[mckenzie]

I seem to remember years ago being told by the Pillow salesman in John Lewis to be careful when buying pillows for youngsters, presumably to make sure they are not too firm. Does anyone know if this is correct? We've just come back from Centreparcs and DD said that the bed there was the most comfortable she's ever slept in and the pillow was "just divine". Her pillow here at home, on inspection, is looking a tad yukky, for want of a better word, but I don't know what sort to buy for her.