For a newborn child, the variance in weight could be because of many reasons – mother’s diet, age of mother, ethnicity, and weight of the mother. Apart from these factors, there could also be other reasons for a variation in the average weight of a newborn baby. Before a doctor declares a baby healthy, he checks their weight, height, and circumference of the head. In India, doctors follow the WHO reference chart to verify the average weight and height of a newborn baby. Instead of providing a standard value, the health of a child is referenced in percentile. With the combination of height and weight, a doctor would compare it against the weight and height of children of the same gender and would then provide a percentile.