The height requirement for a child varies depending on the country and region. In general, World Health Organization (WHO) recommends that children should be:

  • 45 inches (114 cm) tall by age 2
  • 50 inches (127 cm) tall by age 3-4 years old
  • 55-62 inches (140-157 cm) tall by age 5-6 years old

Please note that these are general guidelines and not a strict requirement for children. Some children may grow at different rates, and others might be shorter or taller than these averages due to various genetic factors.

In the US, Centers for Disease Control and Prevention (CDC) provides growth charts which indicate average height percentiles for boys and girls at different ages:

  • 50th percentile: Boys - 55 inches (139.7 cm), Girls - 54 inches (137 cm) by age 6
  • 60th percentile: Boys - 58 inches (147.3 cm), Girls - 56 inches (142.2 cm) by age 10

These numbers are averages, and individual children may vary. The importance is to monitor a child’s growth regularly with their healthcare provider, rather than focusing on specific height requirements.