Data Table of Infant Weight-for-age Charts

Males, Birth – 36 Months
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

 

Females, Birth – 36 Months
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
Page last reviewed: August 23, 2001