Table 4: Summary of measurements in Cambridge Baby Growth Study infants.

BoysGirls value1

Birth
 Gestational age at birth (weeks) 0.6
 Weight (kg) 0.006
 Length (cm) 0.004
 Ponderal index (kg/m3) 0.2
 Sum of skinfolds (cm) 0.04

3 months2
 Weight (kg) <0.0001
 Length (cm) <0.0001
 Ponderal index (kg/m3) 0.1
 Sum of skinfolds (cm) 0.6
 US-visceral depth (cm) 0.9
 US-subcut abdo depth (cm) 0.7

12 months3
 Weight (kg) <0.0001
 Length (cm) <0.0001
 Ponderal index (kg/m3) 0.7
 Sum of skinfolds (cm) 0.01
 US-visceral depth (cm)4 0.04
 US-subcut abdo depth (cm)4 0.6

Data are means (±standard deviation).
1Student’s t-test was used to compare boys versus girls.
23-month ultrasound measurements were performed in 487 infants (254 boys and 233 girls).
312-month ultrasound measurements were performed in 495 infants (258 boys and 237 girls).
4US: ultrasound.