These simply represent the average weight, height, or head circumference of a bunch of normal children. You will see the percentile lines on the chart running parallel to each other. The ...

Several fellow parents took to the comments section on the video to share similar disparities. "My 6-year-old and 3-year-old share clothes," one wrote.

He says that physicians measure a baby's weight, height, or head circumference compared to others by using growth charts. A baby at the 99th percentile isn't necessarily unhealthy, but doctors ...