Age Average Height Boys Average Height Girls 0 months 20.7in / 52.7cm 20.3in / 51.7cm 1 months 22.3in / 56.6cm 21.8in / 55.3cm 2 months 23.5in / 59.6cm 22.9in / 58.1cm 3 months 24.4in / 62.1cm 23.8in / 60.5cm 4 months 25.3in / 64.2cm 24.6in / 62.5cm 5 months 26in / 66.1cm 25.4in / 64.4cm 6 months 26.7in / 67.9cm 26in / 66.1cm 7 months 27.3in / 69.5cm 26.7in / 67.7cm 8 months 27.9in / 70.9cm 27.2in / 69.2cm 9 months 28.5in / 72.3cm 27.8in / 70.6cm 10 months 29in / 73.7cm 28.3in / 71.9cm 11 months 29.5in / 74.9cm 28.8in / 73.2cm 12 months 30in / 76.1cm 29.3in / 74.4cm 13 months 30.4in / 77.3cm 29.7in / 75.6cm 14 months 30.9in / 78.4cm 30.2in / 76.7cm 15 months 31.3in / 79.4cm 30.6in / 77.8cm 16 months 31.7in / 80.5cm 31in / 78.8cm 17 months 32.1in / 81.4cm 31.4in / 79.8cm 18 months 32.4in / 82.4cm 31.8in / 80.8cm 19 months 32.8in / 83.3cm 32.2in / 81.8cm 20 months 33.2in / 84.2cm 32.6in / 82.7cm 21 months 33.5in / 85.1cm 32.9in / 83.6cm 22 months 33.9in / 86cm 33.3in / 84.5cm 23 months 34.2in / 86.8cm 33.6in / 85.3cm 2 years 2' 10" / 86.9cm 2' 9" / 85.4cm 3 years 3' 1" / 95.3cm 3' 1" / 94.2cm 4 years 3' 4" / 102.5cm 3' 3" / 101cm 5 years 3' 6" / 109.2cm 3' 6" / 108cm 6 years 3' 9" / 115.7cm 3' 9" / 115cm 7 years 4' 0" / 122cm 3' 11" / 121.8cm 8 years 4' 2" / 128.1cm 4' 2" / 127.8cm 9 years 4' 4" / 133.7cm 4' 4" / 133.1cm 10 years 4' 6" / 138.8cm 4' 6" / 138.2cm 11 years 4' 8" / 143.7cm 4' 8" / 144.3cm 12 years 4' 10" / 149.3cm 4' 11" / 151.5cm 13 years 5' 1" / 156.4cm 5' 1" / 157.3cm 14 years 5' 4" / 164.1cm 5' 3" / 160.5cm 15 years 5' 6" / 170.1cm 5' 3" / 161.9cm 16 years 5' 8" / 173.6cm 5' 4" / 162.6cm 17 years 5' 9" / 175.3cm 5' 4" / 162.9cm 18 years 5' 9" / 176.2cm 5' 4" / 163.1cm 19 years 5' 9" / 176.6cm 5' 4" / 163.3cm 20 years 5' 9" / 176.8cm 5' 4" / 163.3cm
