Fig. 1

Unconditional chart for abdominal circumference pooling both genders (solid lines: 5th, 50th and 95th percentiles; long dashed lines: 10th and 90th percentiles; short dashed lines: 25th and 75th percentiles). Tick marks at multiples of 5Â mm from 100 to 350Â mm on the vertical axis, and at single day on the horizontal axis