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©2013 UpToDate ® Print Email Smoothed percentiles of birth weight (grams) by gestational age: United States, 1991, single live births to resident mothers Gestational age, weeks 5th percentile 10th percentile 50th percentile 90th percentile 24 435 498 674 977 25 480 558 779 1138 26 529 625 899 1362 27 591 702 1035 1635 28 670 798 1196 1977 29 772 925 1394 2361 30 910 1085 1637 2710 31 1088 1278 1918 2986 32 1294 1495 2203 3200 33 1513 1725 2458 3370 34 1735 1950 2667 3502 35 1950 2159 2831 3596 36 2156 2354 2974 3668 37 2357 2541 3117 3755 38 2543 2714 3263 3867 39 2685 2852 3400 3980 40 2761 2929 3495 4060 41 2777 2948 3527 4094 42 2764 2935 3522 4098 Note that the 10th percentile birth weight at the lower limit for term pregnancy (37 weeks of gestation) corresponds to approximately 2500 grams, which is also the upper limit for defining low birth weight. Adapted from: Alexander, et al. United States National Reference for Fetal Growth. In Obstet Gynecol 1996; 87:163-168.