Lang Yarns Baby Cotton knitting yarn is composed of 100% organic cotton and knits on knitting needles 2.5-3 mm (US 2-3 / UK 11-10) for a gauge of 25 st. and 34 rows.
With balls of 50g (1.75 oz) having about 180 m (196 yd) plan on:
650g = 13 balls for men size M
500g = 10 balls for women size M
600g = 6 balls for children 10 yrs
Machine wash at 60°C (140°F) with detergent for wool without fabric softener.