In centimeters, it's about 25 cm to 30 cm square. the authors conclude that a 25 gauge, 25 mm needle should be used for infant immunisation. the larger the number, the smaller the needle.
The rule of sewing machine needle sizes: L = length of swatch in inches. for the fingers of gloves, you might only need 10 cm (4 in) needles, while for socks, most knitters prefer 15 cm (6 in), and for a hat knit in the round you might need 20 cm (8. the authors conclude that a 25 gauge, 25 mm needle should be used for infant immunisation.
