The sleeves are made by increasing the number of stitches in the front and the back.

Measurements
to fit doll length
59 cm (23 inch)
Width around body
48 cm (19 inch)

Each pattern has a different set of recommended yarns. The following is from the Teddy version.

Materials
Teddy DOUBLE KNITTING
Family DK
2 100 g balls
Classic DK
2 100 g balls
Springtime DK
5 25 g balls
Baby Softspun DK
2 100 g balls
Stitch holders.