These are the flexible sizes for respective age group as per mentioned

SHIRT	SIZE	LENGTH CM	WIDTH CM	SLEEVES CM
	2-3Y	41	36	11
	3-4Y	43	37	11
	4-5Y	45	38	12
	5-6Y	49	38	13
	6-7Y	52	39	13
	7-8Y	54	40	15
	8-9Y	56	42	15
	9-10Y	60	43	17
	11-12Y	64	46	19