Height comparison table for boys and babies, 1 year, about 75cm, 2 years old, about 85cm. Three-year-old children should be around 95cm, four-year-old children should be around 105cm, five-year-old children should be around 15cm, six-year-old children should be around 1.3m, nine-year-old children should be around 1.35 m, and 10-year-old children should be around. ..