Use the appropriate size of needles for the yarn you choose. The weight of the yarn will determine the size of the bear. Size 3.75mm with double knitting yarn would be a good match.

Pins to hold bear together while sewing; a tapestry needle; synthetic stuffing; dark coloured yarn or buttons for eyes, nose and mouth.

Also at UK Handknitting site:
http://www.ukhandknitting.com/knitting-for-charity/charit...