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Parents often wonder about the normal growth of their children. While general guidelines can be followed, always remember variations are the norm with kids! Typically, height doubles between 3 and 4 years old; then, it triples by 13 years old (based on height at birth). Weight usually doubles by about 5 months of age, triples by 12 months of age, and quadruples from 2 to 2 1/2 years of age (based on weight at birth).