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. 2017 Jan 24;14(1):e1002220. doi: 10.1371/journal.pmed.1002220

Table 9. Growth chart for fetal femur length.

Gestational Age (Weeks) Femur Length (mm) by Percentile
2.5 5 10 25 50 75 90 95 97.5
14 10 10 11 12 13 14 15 16 17
15 12 13 14 15 16 17 18 19 20
16 15 16 17 18 19 20 22 22 23
17 19 19 20 21 22 24 25 26 26
18 22 22 23 24 26 27 28 29 30
19 25 26 26 28 29 30 31 32 33
20 28 29 30 31 32 33 35 35 36
21 31 32 33 34 35 36 38 38 39
22 34 35 35 37 38 39 40 41 42
23 36 37 38 39 41 42 43 44 45
24 39 40 41 42 43 45 46 47 47
25 41 42 43 44 46 47 48 49 50
26 43 44 45 46 48 49 51 51 52
27 46 46 47 49 50 52 53 54 55
28 48 48 49 51 52 54 55 56 57
29 50 50 51 53 54 56 57 58 59
30 51 52 53 55 56 58 60 60 61
31 53 54 55 57 59 60 62 63 64
32 55 56 57 59 61 62 64 65 66
33 57 58 60 61 63 65 66 67 68
34 59 60 61 63 65 67 68 69 70
35 61 62 63 65 67 69 70 71 73
36 63 64 65 67 69 70 72 73 75
37 65 66 67 68 70 72 74 75 76
38 66 67 68 70 72 74 75 77 78
39 67 68 69 70 73 75 76 78 79
40 68 68 69 70 73 75 77 78 79