Average Height for a 9 Year Old Girl (CDC Data)

Average Height for a 9 Year Old Girl

Pediatricians use CDC growth charts to track whether a child is growing appropriately for their age and sex. At age 9, the median stature for girls—the 50th percentile—is 123 cm (4'0").

Growth rates and final adult height vary widely among children. Genetics account for roughly 60–80% of height, while nutrition, sleep, and overall health influence the rest. Comparing your child to the CDC reference helps identify whether growth is on track.

The table below shows CDC stature-for-age percentiles for 9-year-old girls, from the 5th percentile (shorter end of normal) to the 95th percentile (taller end of normal).

Is My Child's Height Normal?

A common question from parents is whether their 9-year-old is "too short" or "too tall." CDC growth charts define normal as falling between roughly the 5th and 95th percentiles for age and sex—not exactly at the 50th.

If your child tracks consistently along the same percentile curve over time, that pattern is usually reassuring even if they are at the 10th or 90th percentile. What matters most is steady growth velocity, not hitting the exact average.

Sudden drops or jumps across percentile lines, or measurements below the 3rd or above the 97th percentile, are reasons to discuss growth with a pediatrician. A single measurement at age 9 should be interpreted in context of prior measurements.

For a 9-year-old girl, the CDC defines a typical range from the 5th percentile (113 cm / 3'8") to the 95th percentile (134 cm / 4'5"). Heights within this band are generally considered normal for age. Percentiles below the 5th or above the 95th warrant a conversation with your pediatrician—not necessarily a problem, but worth monitoring.

How Much Will They Grow From Here?

Children do not grow at a constant rate. After rapid infant growth, girls ages 4–10 typically gain about 5–7 cm per year before the adolescent growth spurt.

Girls often begin puberty between ages 8–13, with a growth spurt that adds several inches over 2–3 years. At age 9, some girls are pre-pubescent while others have already started their spurt.

Growth velocity at age 9 is typically about 5 cm per year. A girl at this age has about 43 cm of growth remaining; puberty growth spurts may begin. Individual timing varies widely based on genetics and puberty onset.