Data Table of Infant Weight-for-age Charts
| Age (in months) | 3rd Percentile Weight (in kilograms) | 5th Percentile Weight (in kilograms) | 10th Percentile Weight (in kilograms) | 25th Percentile Weight (in kilograms) | 50th Percentile Weight (in kilograms) | 75th Percentile Weight (in kilograms) | 90th Percentile Weight (in kilograms) | 95th Percentile Weight (in kilograms) | 97th Percentile Weight (in kilograms) |
|---|---|---|---|---|---|---|---|---|---|
| 0 | 2.355451 | 2.526904 | 2.773802 | 3.150611 | 3.530203 | 3.879077 | 4.172493 | 4.340293 | 4.446488 |
| 0.5 | 2.799549 | 2.964656 | 3.20951 | 3.597396 | 4.003106 | 4.387423 | 4.718161 | 4.91013 | 5.032625 |
| 1.5 | 3.614688 | 3.774849 | 4.020561 | 4.428873 | 4.879525 | 5.327328 | 5.728153 | 5.967102 | 6.121929 |
| 2.5 | 4.342341 | 4.503255 | 4.754479 | 5.183378 | 5.672889 | 6.175598 | 6.638979 | 6.921119 | 7.10625 |
| 3.5 | 4.992898 | 5.157412 | 5.416803 | 5.866806 | 6.391392 | 6.942217 | 7.460702 | 7.781401 | 7.993878 |
| 4.5 | 5.575169 | 5.744752 | 6.013716 | 6.484969 | 7.041836 | 7.635323 | 8.202193 | 8.556813 | 8.793444 |
| 5.5 | 6.096775 | 6.272175 | 6.551379 | 7.043627 | 7.630425 | 8.262033 | 8.871384 | 9.255615 | 9.513307 |
| 6.5 | 6.56443 | 6.745993 | 7.035656 | 7.548346 | 8.162951 | 8.828786 | 9.475466 | 9.885436 | 10.16135 |
| 7.5 | 6.984123 | 7.171952 | 7.472021 | 8.004399 | 8.644832 | 9.34149 | 10.02101 | 10.45331 | 10.74492 |
| 8.5 | 7.361236 | 7.555287 | 7.865533 | 8.416719 | 9.08112 | 9.805593 | 10.51406 | 10.96574 | 11.27084 |
| 9.5 | 7.700624 | 7.900755 | 8.220839 | 8.789882 | 9.4765 | 10.22612 | 10.96017 | 11.42868 | 11.74538 |
| 10.5 | 8.006677 | 8.212684 | 8.542195 | 9.12811 | 9.835308 | 10.60772 | 11.36445 | 11.84763 | 12.17436 |
| 11.5 | 8.283365 | 8.495 | 8.833486 | 9.435279 | 10.16154 | 10.95466 | 11.7316 | 12.22766 | 12.56308 |
| 12.5 | 8.534275 | 8.751264 | 9.098246 | 9.714942 | 10.45885 | 11.27087 | 12.06595 | 12.5734 | 12.91645 |
| 13.5 | 8.762649 | 8.984701 | 9.339688 | 9.970338 | 10.73063 | 11.55996 | 12.37145 | 12.88911 | 13.23893 |
| 14.5 | 8.971407 | 9.198222 | 9.560722 | 10.20442 | 10.97992 | 11.82524 | 12.65175 | 13.17867 | 13.53462 |
| 15.5 | 9.16318 | 9.394454 | 9.763982 | 10.41986 | 11.20956 | 12.06973 | 12.91015 | 13.44564 | 13.80724 |
| 16.5 | 9.340328 | 9.575757 | 9.95184 | 10.6191 | 11.42207 | 12.29617 | 13.14969 | 13.69325 | 14.06019 |
| 17.5 | 9.504964 | 9.744251 | 10.12643 | 10.80433 | 11.61978 | 12.50708 | 13.37311 | 13.92444 | 14.29655 |
| 18.5 | 9.658975 | 9.90183 | 10.28968 | 10.97753 | 11.80478 | 12.70473 | 13.5829 | 14.14187 | 14.51909 |
| 19.5 | 9.804039 | 10.05019 | 10.4433 | 11.14047 | 11.97897 | 12.89117 | 13.78133 | 14.34795 | 14.73034 |
| 20.5 | 9.941645 | 10.19082 | 10.58881 | 11.29477 | 12.14404 | 13.06825 | 13.97042 | 14.54484 | 14.93256 |
| 21.5 | 10.07311 | 10.32507 | 10.72759 | 11.44185 | 12.30154 | 13.23765 | 14.15201 | 14.73448 | 15.12777 |
| 22.5 | 10.19957 | 10.4541 | 10.86084 | 11.58298 | 12.45283 | 13.40086 | 14.32772 | 14.91861 | 15.31777 |
| 23.5 | 10.32206 | 10.57895 | 10.98963 | 11.7193 | 12.59913 | 13.5592 | 14.499 | 15.09876 | 15.50418 |
| 24.5 | 10.44144 | 10.70051 | 11.1149 | 11.85182 | 12.74154 | 13.71386 | 14.66716 | 15.2763 | 15.68841 |
| 25.5 | 10.55847 | 10.81958 | 11.23747 | 11.98142 | 12.88102 | 13.8659 | 14.83332 | 15.45242 | 15.8717 |
| 26.5 | 10.6738 | 10.93681 | 11.35806 | 12.10889 | 13.01842 | 14.01623 | 14.99848 | 15.62819 | 16.05514 |
| 27.5 | 10.78798 | 11.0528 | 11.47728 | 12.23491 | 13.1545 | 14.16567 | 15.16351 | 15.8045 | 16.23967 |
| 28.5 | 10.90147 | 11.16803 | 11.59567 | 12.36007 | 13.2899 | 14.31493 | 15.32917 | 15.98214 | 16.42609 |
| 29.5 | 11.01466 | 11.28293 | 11.71368 | 12.4849 | 13.42519 | 14.46462 | 15.4961 | 16.16177 | 16.61508 |
| 30.5 | 11.12787 | 11.39782 | 11.8317 | 12.60983 | 13.56088 | 14.61527 | 15.66485 | 16.34395 | 16.8072 |
| 31.5 | 11.24135 | 11.513 | 11.95005 | 12.73523 | 13.69738 | 14.76732 | 15.83588 | 16.52915 | 17.00291 |
| 32.5 | 11.3553 | 11.62869 | 12.069 | 12.86144 | 13.83505 | 14.92117 | 16.00958 | 16.71773 | 17.2026 |
| 33.5 | 11.46988 | 11.74508 | 12.18875 | 12.9887 | 13.97418 | 15.07711 | 16.18624 | 16.91 | 17.40654 |
| 34.5 | 11.58521 | 11.8623 | 12.30948 | 13.11723 | 14.11503 | 15.23541 | 16.36612 | 17.10619 | 17.61495 |
| 35.5 | 11.70137 | 11.98046 | 12.43132 | 13.24721 | 14.2578 | 15.39628 | 16.5494 | 17.30646 | 17.82797 |
| 36 | 11.75978 | 12.03991 | 12.49268 | 13.31278 | 14.32994 | 15.47772 | 16.64237 | 17.40816 | 17.93625 |
| Age (in months) | 3rd Percentile Weight (in kilograms) | 5th Percentile Weight (in kilograms) | 10th Percentile Weight (in kilograms) | 25th Percentile Weight (in kilograms) | 50th Percentile Weight (in kilograms) | 75th Percentile Weight (in kilograms) | 90th Percentile Weight (in kilograms) | 95th Percentile Weight (in kilograms) | 97th Percentile Weight (in kilograms) |
|---|---|---|---|---|---|---|---|---|---|
| 0 | 2.414112 | 2.547905 | 2.747222 | 3.064865 | 3.399186 | 3.717519 | 3.992572 | 4.152637 | 4.254922 |
| 0.5 | 2.756917 | 2.894442 | 3.101767 | 3.437628 | 3.797528 | 4.145594 | 4.450126 | 4.628836 | 4.743582 |
| 1.5 | 3.402293 | 3.54761 | 3.770157 | 4.138994 | 4.544777 | 4.946766 | 5.305632 | 5.519169 | 5.657379 |
| 2.5 | 3.997806 | 4.150639 | 4.387042 | 4.78482 | 5.230584 | 5.680083 | 6.087641 | 6.332837 | 6.492574 |
| 3.5 | 4.547383 | 4.707123 | 4.955926 | 5.379141 | 5.859961 | 6.351512 | 6.80277 | 7.076723 | 7.256166 |
| 4.5 | 5.054539 | 5.220488 | 5.480295 | 5.925888 | 6.437588 | 6.966524 | 7.457119 | 7.757234 | 7.95473 |
| 5.5 | 5.5225 | 5.693974 | 5.96351 | 6.428828 | 6.96785 | 7.53018 | 8.056331 | 8.38033 | 8.594413 |
| 6.5 | 5.954272 | 6.130641 | 6.408775 | 6.891533 | 7.454854 | 8.047178 | 8.605636 | 8.951544 | 9.180938 |
| 7.5 | 6.352668 | 6.533373 | 6.819122 | 7.317373 | 7.902436 | 8.521877 | 9.109878 | 9.476009 | 9.719621 |
| 8.5 | 6.720328 | 6.904886 | 7.197414 | 7.709516 | 8.314178 | 8.958324 | 9.573546 | 9.95848 | 10.21539 |
| 9.5 | 7.059732 | 7.247736 | 7.546342 | 8.070932 | 8.693418 | 9.360271 | 10.00079 | 10.40335 | 10.6728 |
| 10.5 | 7.373212 | 7.564327 | 7.868436 | 8.4044 | 9.043262 | 9.731193 | 10.39545 | 10.8147 | 11.09607 |
| 11.5 | 7.662959 | 7.856916 | 8.166069 | 8.712513 | 9.366594 | 10.07431 | 10.76106 | 11.19625 | 11.48908 |
| 12.5 | 7.93103 | 8.127621 | 8.44146 | 8.997692 | 9.666089 | 10.39258 | 11.10089 | 11.55145 | 11.85539 |
| 13.5 | 8.179356 | 8.378425 | 8.696684 | 9.262185 | 9.944226 | 10.68874 | 11.41792 | 11.88348 | 12.19829 |
| 14.5 | 8.409744 | 8.611186 | 8.93368 | 9.508085 | 10.20329 | 10.96532 | 11.71491 | 12.19522 | 12.52078 |
| 15.5 | 8.623887 | 8.827638 | 9.154251 | 9.737329 | 10.44541 | 11.22463 | 11.99438 | 12.48934 | 12.82561 |
| 16.5 | 8.82337 | 9.029399 | 9.360079 | 9.951715 | 10.67251 | 11.46878 | 12.25862 | 12.76825 | 13.11527 |
| 17.5 | 9.009668 | 9.21798 | 9.552723 | 10.1529 | 10.88639 | 11.69972 | 12.50974 | 13.03415 | 13.39204 |
| 18.5 | 9.18416 | 9.394782 | 9.73363 | 10.34241 | 11.08868 | 11.91921 | 12.74964 | 13.28904 | 13.65799 |
| 19.5 | 9.348127 | 9.56111 | 9.90414 | 10.52167 | 11.2809 | 12.12887 | 12.98004 | 13.53473 | 13.91497 |
| 20.5 | 9.50276 | 9.71817 | 10.06549 | 10.69196 | 11.4644 | 12.33016 | 13.2025 | 13.77284 | 14.16467 |
| 21.5 | 9.649162 | 9.867081 | 10.21882 | 10.85446 | 11.64043 | 12.52439 | 13.41844 | 14.00484 | 14.40858 |
| 22.5 | 9.788355 | 10.00887 | 10.36518 | 11.01027 | 11.81014 | 12.71277 | 13.62911 | 14.23205 | 14.64807 |
| 23.5 | 9.921281 | 10.1445 | 10.50553 | 11.16037 | 11.97454 | 12.89636 | 13.83564 | 14.45561 | 14.88432 |
| 24.5 | 10.04881 | 10.27483 | 10.64076 | 11.30567 | 12.13456 | 13.07613 | 14.03902 | 14.67659 | 15.11839 |
| 25.5 | 10.17173 | 10.40066 | 10.77167 | 11.44697 | 12.29102 | 13.25293 | 14.24017 | 14.89587 | 15.35122 |
| 26.5 | 10.29079 | 10.52274 | 10.89899 | 11.58501 | 12.44469 | 13.42753 | 14.43984 | 15.11428 | 15.58363 |
| 27.5 | 10.40664 | 10.64171 | 11.02338 | 11.72047 | 12.59622 | 13.60059 | 14.63873 | 15.33249 | 15.81632 |
| 28.5 | 10.5199 | 10.75819 | 11.14545 | 11.85392 | 12.74621 | 13.77271 | 14.83743 | 15.55113 | 16.0499 |
| 29.5 | 10.63112 | 10.87273 | 11.26575 | 11.98592 | 12.89517 | 13.9444 | 15.03646 | 15.7707 | 16.28491 |
| 30.5 | 10.74078 | 10.98581 | 11.38474 | 12.11692 | 13.04357 | 14.11611 | 15.23626 | 15.99164 | 16.52176 |
| 31.5 | 10.84935 | 11.09789 | 11.50288 | 12.24735 | 13.19181 | 14.28822 | 15.43719 | 16.21432 | 16.76085 |
| 32.5 | 10.95722 | 11.20934 | 11.62054 | 12.37757 | 13.34023 | 14.46106 | 15.63957 | 16.43904 | 17.00245 |
| 33.5 | 11.06475 | 11.32054 | 11.73806 | 12.50791 | 13.48913 | 14.63491 | 15.84365 | 16.66605 | 17.24681 |
| 34.5 | 11.17225 | 11.43177 | 11.85574 | 12.63865 | 13.63877 | 14.80998 | 16.04963 | 16.89553 | 17.49412 |
| 35.5 | 11.28 | 11.54332 | 11.97384 | 12.77001 | 13.78937 | 14.98647 | 16.25767 | 17.12762 | 17.7445 |
| 36 | 11.33404 | 11.59929 | 12.03312 | 12.836 | 13.86507 | 15.07529 | 16.3625 | 17.24469 | 17.87089 |
