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Table 5 EFW reference values for boys and girls from 12 to 40 weeks

From: Sex differences in fetal growth and immediate birth outcomes in a low-risk Caucasian population

GA Boys (EFW) Girls (EFW)
C5 C10 C50 C90 C95 C5 C10 C50 C90 C95
12 50 51 57 63 65 49 50 55 61 63
13 60 62 69 78 81 61 62 69 76 79
14 77 80 89 101 105 79 82 90 101 104
15 104 107 120 136 142 103 106 117 131 136
16 131 136 152 172 179 128 132 147 165 171
17 159 165 185 208 216 159 164 183 206 213
18 199 205 230 260 269 198 204 229 257 266
19 248 256 287 324 336 242 250 281 316 328
20 298 308 346 391 406 290 299 337 380 394
21 352 364 410 465 482 342 354 398 450 466
22 414 429 486 552 574 402 416 470 531 551
23 488 506 576 658 685 475 493 557 631 655
24 574 596 681 781 813 561 582 660 750 779
25 671 698 799 917 955 658 684 777 884 919
26 779 810 928 1065 1110 765 795 905 1032 1073
27 901 938 1073 1230 1280 883 918 1046 1193 1241
28 1038 1080 1233 1410 1467 1014 1054 1201 1369 1424
29 1188 1235 1407 1605 1669 1158 1204 1369 1558 1620
30 1348 1400 1593 1814 1886 1314 1366 1550 1761 1831
31 1511 1571 1788 2035 2116 1478 1536 1743 1979 2059
32 1672 1739 1985 2265 2357 1638 1704 1937 2206 2298
33 1825 1902 2182 2504 2610 1788 1863 2128 2437 2544
34 1970 2058 2380 2752 2876 1927 2012 2314 2671 2796
35 2108 2209 2577 3007 3152 2060 2156 2500 2912 3059
36 2244 2358 2775 3267 3434 2193 2301 2689 3163 3336
37 2379 2506 2974 3530 3720 2330 2452 2887 3428 3629
38 2513 2655 3174 3795 4009 2475 2610 3095 3707 3940
39 2647 2802 3373 4060 4299 2626 2774 3310 3999 4265
40 2776 2946 3570 4325 4591 2780 2943 3531 4300 4605
  1. Reference values in grams for estimated fetal weight (EFW) for boys and girls for each gestational week for the median and 5th, 10th, 90th, and 95th centiles
  2. GA gestational age