A girl is considered short if she is shorter than 97 percent of girls the same age, according to Parents. While height is a descriptive term perceived relative to culture and family background, height also is a statistical measure that is compared to others of the same sex and age.
According to Family Practice Notebook, by the age of 13 years, a child normally is triple her birth length. The normal height for children falls between the third and 97th percentiles, meaning the child is at least as tall as 97 percent of peers the same age but not taller than the tallest 3 percent. A normal range for a 5-year-old girl is 40 to 47 inches tall. A normal range for a 10-year-old girl is 50 to 59 inches tall. A normal range for a 15-year-old girl is 59 to 68 inches tall.