Language is a system of symbols and rules that is used for meaningful communication. A system of communication has to meet certain criteria in order to be considered a language: 1  A language uses symbols, which are sounds, gestures, or written characters that represent objects, actions, events, and ideas. A language uses symbols, which are sounds, gestures, or written characters that represent objects, actions, events, and ideas. 2  Symbols enable people to refer to objects that are in another place or events that occurred at a different time.
Also remember that children between the ages of 6 and 18 months can normally move up or down on their percentiles, but older children should follow their growth curve fairly closely. Answers to examples: 1) 50th percentile, 2) 10th percentile, 3) 50th percentile, 4) 75th percentile, 5) about the 15th percentile.
Growing pains are not a sign that your child is doing anything wrong or needs to slow down, however. Perfectly healthy children experience them. In fact, 25 to 40 percent of children have growing pains at some point, and they're slightly more common in girls than in boys. Child Growth Chart Calculator Create a growth chart to see how your child measures up against other children in height, weight, and head size.