Measurements
Size 1:
To fit Birth to 4 months
Size 2:
To fit 4 to 8 months.

Each pamphlet has a different set of recommended yarns. The following is from the Jarol version.

Materials
Jarol Double Knitting
Imps and Angels
Main Colour: 1, 2 X 20 gram balls
Contrast Colour: 1, 1 X 20 gram ball
Baby Double Knitting
Main Colour: 2, 2 X 20 gram balls
Contrast Colour: 1, 1 X 20 gram ball
1 button.

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The following is from the Bruneau version.
Sizes To fit Birth to 4 months / 4 to 8 months
Materials
PETER PAN Baby Sport Yarn
Main Colour: 20 grams / 30 grams
Contrast Colour: 20 grams / 20 grams
Pair needles each size 3¾mm (Eng 9, Amer 5) and 3¼mm (Eng 10, Amer 3).
1 button.
Gauge
23 sts and 46 rows = 10 cms (4 ins) square measured over garter stitch using larger needles.