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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.
1 Usually by the age of 18, a child's height is double of their height when they are 2 years old. 2  Normally babies triple their birth-weight by the end of their first year. By the age of 8 to 9 a child attains 75% of their adult height. 2  It is important to keep track of the growth of your child. 3  Early detection of an anomaly can help parents in taking corrective measures.