Weight-for-length for girls at 109 cm

At a length of 109 cm, the median weight for girls on the WHO Child Growth Standards is 18.0 kg (39 lb 9 oz): half of girls of this length weigh less and half more. The middle half of girls, from the 25th to the 75th percentile, falls between 16.9 and 19.1 kg, a spread of 2.27 kg. The outer lines of the chart, the 2nd and 98th percentiles, sit at 15.0 and 21.8 kg.

At 107 cm the median weight is 17.2 kg, so 2 cm of extra length goes with about 0.73 kg more weight at the median. At 110 cm it is 18.3 kg. 109 cm is close to the median height of girls at 5 years (107.7 cm). Weight-for-length compares a child's weight with other children of the same length, whatever their age, which is why it can read differently from weight-for-age for a long or a short baby.

For boys at a length of 109 cm the median is 17.9 kg, 0.03 kg less than for girls, which is why the charts are drawn separately by sex.

CDC 2000 weight-for-length tables stop at 103.5 cm, so at 109 cm only the WHO standard applies.

Reading the table: a girl at a length of 109 cm who weighs 18.7 kg is at about the 67th percentile, meaning that out of 100 girls of that length, about 67 weigh less.