Table 2.
Average infant growth measures from birth to six months and body composition measures at six months.
| Infant Characteristics | N | Mean ± SD |
|---|---|---|
| Infant Growth from Birth to Six Months | ||
| Weight-for-age, Z-scores | ||
| Birth | 350 | 0.46 ± 0.87 |
| one month | 343 | 0.13 ± 0.87 |
| three months | 332 | −0.07 ± 0.88 |
| six months | 321 | 0.04 ± 0.96 |
| Length-for-age, Z-scores | ||
| Birth | 342 | 1.17 ± 1.23 |
| one month | 346 | 0.06 ± 1.09 |
| three months | 332 | −0.03 ± 1.06 |
| six months | 321 | −0.20 ± 1.09 |
| Weight-for-length, Z-scores | ||
| Birth | 341 | −0.72 ± 1.40 |
| one month | 342 | 0.12 ± 1.08 |
| three months | 332 | 0.02 ± 0.98 |
| six months | 321 | 0.33 ± 1.07 |
| Infant body composition at six months | ||
| Total body fat, % | 317 | 33.98 ± 3.76 |
| Fat mass, kg | 317 | 2.76 ± 0.48 |
| Fat-free mass, kg | 317 | 5.29 ± 0.67 |
| Trunk fat mass, kg | 317 | 0.92 ± 0.22 |
| Arm fat mass, kg | 317 | 0.38 ± 0.20 |
| Leg fat mass, kg | 317 | 1.08 ± 0.23 |
Abbreviations: SD = standard deviation.