Table 1: Infants characteristics in the Cambridge Baby Growth Study with ultrasound measures at 3 months, 12 months and both at 3 and 12 months1.

US at 3 months onlyUS at 12 months onlyUS at 3 and 12 months

 Gestational age at birth (weeks)
 Weight (kg)
 Length (cm)
 Ponderal index (kg/m3)
 Sum of skinfolds (cm)

1Data are means (±standard deviations).
US: ultrasound.