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Table 2 Estimated birth weight percentile by gestational age for babies born to HIV-negative women in Botswana

From: Birth weight for gestational age norms for a large cohort of infants born to HIV-negative women in Botswana compared with norms for U.S.-born black infants

   Estimated birth weight percentile (grams) by gestational age  
Gestation age (weeks) N 3rd 5th 10th 25th 50th 75th 90th 95th 10th U.S.*
30 62 946 1042 1170 1380 1693 2255 2699 2840 980
31 71 1067 1179 1318 1553 1915 2475 2895 3038 1188
32 119 1214 1336 1485 1740 2130 2664 3054 3200 1419
33 162 1384 1509 1670 1936 2333 2822 3179 3330 1616
34 268 1574 1697 1866 2135 2520 2950 3277 3433 1849
35 394 1777 1891 2067 2332 2688 3055 3356 3517 2070
36 687 1979 2082 2260 2517 2834 3146 3427 3590 2248
37 1056 2165 2258 2433 2680 2960 3230 3500 3663 2439
38 1758 2313 2405 2570 2810 3065 3320 3588 3747 2632
39 2340 2409 2510 2660 2900 3152 3420 3697 3848 2750
40 2482 2471 2580 2714 2957 3220 3511 3800 3945 2814
41 1357 2525 2626 2750 2992 3270 3570 3867 4015 2836
42 746 2577 2654 2773 3012 3305 3600 3900 4060 2779
43 125 2629 2670 2788 3021 3330 3610 3910 4088 2770
  1. * 10th percentile for U.S.-born black infants. Oken E, Kleinman KP, Rich-Edwards J, Gillman MW. A nearly continuous measure of birth weight for gestational age using a United States national reference. BMC Pediatrics 2003;3:10