The price of a children's bicycle is primarily driven by frame material, braking systems, and component quality. For entry-level pricing, high-carbon steel frames are common due to their durability and low cost, though they are heavier. Mid-to-high-end models utilize aluminum alloy (6061) or magnesium alloy, which significantly reduce weight and increase maneuverability. Ensure the bike features sealed bearing hubs for longevity and adjustable seat posts/handlebars to accommodate child growth, maximizing the product's lifecycle value.