Short cardigan with gathered sleeves in sizes 3/6/12/18 months

2/2/3/3 skeins of mérinos yarn for the short sleeved version (110 m/50g)
3/3/4/4 skiens of mérinos for the long sleeved version (110 m/50g)
3 mm (US 2 ½) & 3.5 mm (US 4) needles (circular needles are recommended)
2 or 3 x 10 mm buttons
Gauge/tension in Stocking(ette) st (St st) : 24 sts x 32 rows = 10 x 10 cm