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Most children will reach an adult height within 4 inches (10 centimeters) of this estimation. Another way to estimate a child's adult height is to double a boy's height at age 2 or a girl's height at age 18 months.Remember, a child's height is controlled by genetics.It's also important to note that children grow at different rates.ost children will reach an adult height within 4 inches (10 centimeters) of this estimation. Another way to estimate a child's adult height is to double a boy's height at age 2 or a girl's height at age 18 months.
How children grow. From age 2 to 4, kids add about 2 to 3 inches in height per year and up to 4 pounds in weight. (From ages 1 to 3, growth takes place primarily in the legs and trunk.) Your child's doctor monitors growth at checkups and plots the numbers on a graph (called a growth chart) to make sure his size is proportionate and healthy.