The company's sizes description for these pyjamases are stated below. however, the ones that overlap with a higher age are children bigger than their ages :
size 24: 12-14 yearssize 16: 8-9 yearssize 14: 7-8 yearssize 12: 6-7 yearssize 10: 5-6 yearsize 8: 4 years+size 6: 3-4 yearssize 4: 2-3 yearssize 3: 1 1/2 - 2 yearssize 2: 1 yearsize 1 : 0- 1 year