Newborn NewBorn 18-19 19 20 20-21 21 22 22-23 23 24 24-25 25 26 26-27 27 28 28-29 29 30 30-31 31 32 32-33 33 34 34-35 35 36 37 38 39 0M+ 6M+ 0-3 Month 0-6 Month 0-18 Month 0-24 Month 3 Month 3-6 Month 6 Month 6-9 Month 6-12 Month 9 Month 9-12 Month 12 Month 12-18 Month 12-24 Month 18 Month 18-24 Month 24 Month 24-36 Month 36 Months 48 Months 0-1 Year 1 Year 1-2 Year 1-3 Year 2 Year 2-3 Year 2-4 Year 2.5 Year 3 Year 3-4 Year 3-5 Year 3-6 Year 4 Year 4-5 Year 4-6 Year 4-8 Year 4-10 Year 5 Year 5-6 Year 5-7 Year 5-8 Year 5-10 Year 6 Year 6-7 Year 6-8 Year 7 Year 7-8 Year 8 Year 8-9 Year 8-10 Year 9 Year 9-10 Year 10 Year 10-11 Year 11-12 Year 11-13 Year 12-13 Year 12-15 Year 13-14 Year 14-15 Year 0-3 Month (12 inch) 12-18 Month (18 inch) L (9-12 Year) M ( 5-9 Year) Premature S (3-5 Year)