There are clear instructions on how to do the buttonhole border for both boys and girls.

Measurements
To fit chest 61, 66, 71, 76 cm
(approx. 24, 26, 28, 30 in)
Garment measures 68, 73, 79, 84 cm
(approx. 27, 28½, 31, 33 in)
Length from top of shoulders 38, 42, 45, 49 cm
(approx. 15, 16½, 17½, 19½ in)
Sleeve seam 31, 35, 39, 43 cm
(approx. 12, 14, 15½, 17 in)

Materials
Patons Diploma Double Knitting or
Patons Clansman Double Knitting or
Patons Moorland Shetland and Tweed Double Knitting
Main Shade 3, 4, 5, 6 X 50 gram balls
1st Contrast 2, 3, 3, 3 X 50 gram balls
2nd Contrast 1, 1, 2, 2 X 50 gram balls
Patons Beehive Double Knitting
Main Shade 3, 3, 4, 5 X 50 gram balls
1st Contrast 2, 2, 2, 2 X 50 gram balls
2nd Contrast 1, 1, 1, 1 X 50 gram balls.
7 buttons.