All our clothing are of standard Australian sizing.
Size 0000 = fits newborn, up to 4kg
Size 000 = fits 0~3 months, up to 6kg
Size 00 = fits 3~6 months, up to 8kg
Size 0 = fits 6~12 months, up to 10kg
Size 1 = fits 1~2 years, up to 14kg