Age, anthropometry, energy expenditure, and growth costs of each age group; values are mean (SD) unless otherwise stated
| 6 weeks | 12 weeks | 6 months | 9 months | 12 months | |
|---|---|---|---|---|---|
| Number | 49 | 92 | 37 | 36 | 18 |
| % Boys | 41 | 44 | 35 | 34 | 55 |
| % Breast fed | 41 | 42 | 51 | 58 | 83 |
| Age (days) | 36 (3) | 81 (6) | 181 (5) | 276 (4) | 368 (5) |
| Weight (kg) | 4.54 (0.48) | 5.89 (0.60) | 7.70 (0.77) | 8.91 (1.14) | 10.27 (1.36) |
| Length (cm) | 54.7 (1.8) | 59.9 (2.1) | 66.7 (2.1) | 71.6 (2.9) | 76.8 (3.7) |
| Triceps (mm) | 6.6 (0.9) | 7.7 (1.3) | 7.6 (1.3) | 8.3 (2.2) | 9.0 (2.1) |
| Subscapular (mm) | 6.8 (1.0) | 7.6 (1.4) | 7.3 (1.3) | 6.6 (1.3) | 6.6 (1.7) |
| BMI (kg/m2) | 15.2 (1.1) | 16.4 (1.2) | 17.3 (1.3) | 17.5 (1.6) | 17.3 (1.3) |
| Weight gain (kg/week) | 0.24 (0.08) | 0.20 (0.10) | 0.12 (0.10) | 0.11 (0.11) | 0.09 (0.09) |
| Predicted SMR (kJ/kg/day) | 237 (3) | 230 (3) | 223 (5) | 219 (5) | 218 (5) |
| TEE (kJ/day) | 1270 (380) | 1800 (420) | 2530 (420) | 3020 (670) | 3290 (540) |
| TEE (kJ/kg/day) | 281 (80) | 297 (75) | 329 (52) | 337 (76) | 323 (58) |
| FFM (kg) | 3.66 (0.33) | 4.49 (0.47) | 5.55 (0.47) | 6.54 (0.86) | 7.69 (0.99) |
| Fat mass (kg) | 0.87 (0.31) | 1.39 (0.45) | 2.15 (0.53) | 2.44 (0.65) | 2.58 (0.90) |
| Fat gain (g/day) | 14.4 (3.2) | 12.8 (3.7) | 3.7 (4.0) | 3.1 (5.2) | 1.7 (3.3) |
| Protein gain (g/day) | 3.3 (1.4) | 2.8 (1.7) | 2.5 (1.7) | 2.4 (1.9) | 2.1 (1.6) |