Here you can follow the weight of the kittens day by day (the weight of course is in grams). The page will be updated regularly.
| Date | Henri | Marie | Pierre |
| Birth weight (13th May) | 124 | 124 | 122 |
| Day 1 | 124 | 130 | 126 |
| Day 2 | 134 | 136 | 138 |
| Day 3 | 152 | 160 | 156 |
| Day 4 | 162 | 170 | 166 |
| Day 5 | 180 | 184 | 186 |
| Day 6 | 208 | 216 | 206 |
| Day 7 | 218 | 228 | 214 |
| Weight increase week 1 | 94 | 104 | 92 |
| Day 8 | 228 | 252 | 238 |
| Day 9 | 242 | 268 | 242 |
| Day 10 | 258 | 280 | 258 |
| Day 11 | 264 | 292 | 272 |
| Day 12 | 282 | 310 | 288 |
| Day 14 (2 weeks old) | 290 | 324 | 308 |
| Day 15 | 316 | 360 | 332 |
| Day 16 | 338 | 386 | 352 |
| Day 17 | 366 | 402 | 366 |
| 3 weeks old | 394 | 430 | 408 |
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