Every child is unique and different and to compare them with other children of the same age is a dangerous and compromised way to think about both parenting and childhood. (madelinelevine.com)
A child is considered to have a speech delay if their speech development is below the norm for other children of the same age. (ph.theasianparent.com)
A child is considered obese if he is heavier than 95 percent of other children of the same age and height. (articles.chicagotribune.com)