What’s a growth chart?
A growth chart is a visual aid to help parents and health-care providers understand how a baby is growing compared with other similar babies. The charts are created using measurements of many healthy babies at different ages. The babies are then divided into groups called percentiles. To understand percentiles, consider 100 babies. If a baby is the tenth-lightest, the baby is on the 10th percentile for weight. Generally, as the baby grows, the baby should stay close to the same percentile. A group of babies born with a similar weight after pregnancies of a similar length usually grow at roughly the same rate. In other words, they stay with their group. Not keeping pace with the group may mean something is wrong.