Length-for-age BOYS Birth to 13 weeks (z-scores) Week
L
M
S
SD
0 1 2 3 4 5 6
1 1 1 1 1 1 1
49.8842 51.1152 52.3461 53.3905 54.3881 55.3374 56.2357
0.03795 0.03723 0.03652 0.03609 0.03570 0.03534 0.03501
7 8 9 10 11 12 13
1 1 1 1 1 1 1
57.0851 57.8889 58.6536 59.3872 60.0894 60.7605 61.4013
0.03470 0.03442 0.03416 0.03392 0.03369 0.03348 0.03329
Z-scores (length in cm) -1 SD Median
-3 SD
-2 SD
1.8931 1.9030 1.9117 1.9269 1.9417 1.9556 1.9688
44.2 45.4 46.6 47.6 48.6 49.5 50.3
46.1 47.3 48.5 49.5 50.5 51.4 52.3
48.0 49.2 50.4 51.5 52.4 53.4 54.3
1.9809 1.9925 2.0036 2.0144 2.0244 2.0343 2.0440
51.1 51.9 52.6 53.3 54.0 54.7 55.3
53.1 53.9 54.6 55.4 56.0 56.7 57.3
55.1 55.9 56.6 57.4 58.1 58.7 59.4
WHO Child Growth Standards
1 SD
2 SD
3 SD
49.9 51.1 52.3 53.4 54.4 55.3 56.2
51.8 53.0 54.3 55.3 56.3 57.3 58.2
53.7 54.9 56.2 57.2 58.3 59.2 60.2
55.6 56.8 58.1 59.2 60.2 61.2 62.1
57.1 57.9 58.7 59.4 60.1 60.8 61.4
59.1 59.9 60.7 61.4 62.1 62.8 63.4
61.0 61.9 62.7 63.4 64.1 64.8 65.5
63.0 63.9 64.7 65.4 66.2 66.9 67.5