Simplified field tables 2-month length increments (cm) BOYS Birth to 24 months (percentiles) Interval 1st 3rd 5th 15th 25th 50th 75th 85th 95th 97th 99th 0-2 mo 5.9 6.4 6.6 7.3 7.7 8.5 9.3 9.7 10.4 10.6 11.1 1-3 mo 4.7 5.2 5.4 6.0 6.3 7.0 7.7 8.0 8.6 8.9 9.3 2-4 mo 3.4 3.8 4.0 4.6 4.9 5.6 6.2 6.6 7.2 7.4 7.8 3-5 mo 2.3 2.7 3.0 3.5 3.9 4.5 5.1 5.5 6.1 6.3 6.7 4-6 mo 1.7 2.0 2.3 2.8 3.1 3.7 4.3 4.7 5.2 5.4 5.9 5-7 mo 1.3 1.6 1.8 2.3 2.7 3.2 3.8 4.1 4.7 4.9 5.3 6-8 mo 1.0 1.4 1.6 2.1 2.4 3.0 3.5 3.8 4.4 4.6 5.0 7-9 mo 0.9 1.3 1.5 2.0 2.3 2.8 3.4 3.7 4.2 4.4 4.8 8-10 mo 0.8 1.2 1.4 1.8 2.1 2.7 3.2 3.5 4.1 4.3 4.6 9-11 mo 0.7 1.1 1.3 1.7 2.0 2.6 3.1 3.4 3.9 4.1 4.5 10-12 mo 0.7 1.0 1.2 1.7 1.9 2.5 3.0 3.3 3.8 4.0 4.4 11-13 mo 0.6 0.9 1.1 1.6 1.8 2.4 2.9 3.2 3.7 3.9 4.3 12-14 mo 0.5 0.8 1.0 1.5 1.8 2.3 2.8 3.1 3.6 3.8 4.2 13-15 mo 0.4 0.7 0.9 1.4 1.7 2.2 2.8 3.1 3.5 3.7 4.1 14-16 mo 0.3 0.7 0.8 1.3 1.6 2.1 2.7 3.0 3.5 3.7 4.0 15-17 mo 0.3 0.6 0.8 1.2 1.5 2.1 2.6 2.9 3.4 3.6 4.0 16-18 mo 0.2 0.5 0.7 1.2 1.5 2.0 2.5 2.8 3.3 3.5 3.9 17-19 mo 0.2 0.5 0.7 1.1 1.4 1.9 2.5 2.8 3.3 3.5 3.9 18-20 mo 0.1 0.4 0.6 1.1 1.4 1.9 2.4 2.7 3.2 3.4 3.8 19-21 mo 0.0 0.4 0.5 1.0 1.3 1.8 2.4 2.7 3.2 3.4 3.8 20-22 mo 0.0 0.3 0.5 1.0 1.3 1.8 2.4 2.7 3.2 3.4 3.7 21-23 mo 0.0 0.3 0.4 0.9 1.2 1.8 2.3 2.6 3.1 3.3 3.7 22-24 mo 0.0 0.2 0.4 0.9 1.2 1.7 2.3 2.6 3.1 3.3 3.7 WHO Growth Velocity Standards