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Fertility University
Percentiles of Fetal Birth Weight
This table shows the percentiles of birthweights in grams by weeks of the pregnancy and gestational age.
Percentiles of Birth Weight (grams) for gestational Age: US 1991 Single Births
Alexander et al ObGyn 1996
| Weeks | 10th%tile | Average | 90th%tile |
| 20 | 275 | 412 | 772 |
| 21 | 314 | 433 | 790 |
| 22 | 376 | 496 | 826 |
| 23 | 440 | 582 | 882 |
| 24 | 498 | 674 | 977 |
| 25 | 558 | 779 | 1138 |
| 26 | 625 | 899 | 1362 |
| 27 | 702 | 1035 | 1635 |
| 28 | 798 | 1196 | 1977 |
| 29 | 925 | 1394 | 2361 |
| 30 | 1085 | 1637 | 2710 |
| 31 | 1278 | 1918 | 2986 |
| 32 | 1495 | 2203 | 3200 |
| 33 | 1725 | 2458 | 3370 |
| 34 | 1950 | 2667 | 3502 |
| 35 | 2159 | 2831 | 3596 |
| 36 | 2354 | 2974 | 3668 |
| 37 | 2541 | 3117 | 3755 |
| 38 | 2714 | 3263 | 3867 |
| 39 | 2852 | 3400 | 3980 |
| 40 | 2929 | 3495 | 4060 |
| 41 | 2948 | 3527 | 4094 |
| 42 | 2935 | 3522 | 4098 |
| 43 |
2907 | 3505 | 4096 |
| 44 | 2885 | 3491 | 4096 |
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The creator of BabyMed is Dr. Amos Grunebaum, an Ob-Gyn doctor who also developed FertilAid and the Dr.Amos 12-Step Fertility Program. Read his blog HERE.
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