Growth by Age Birth – 2 Months of Age 2-3 Months of Age 4-5 Months of Age 6-8 Months of Age 9-11 Months of Age 12-17 Months of Age 18-23 Months of Age 2 Years of Age 3 Years of Age 4 Years of Age 5-6 Years of Age 7-8 Years of Age 9-10 Years of Age 11-14 Years of Age 15-17 Years of Age 18-21 Years of Age