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According to the rules of many ski resorts, children under 1.4 meters (or approximately 4’7”) are usually considered junior or young kids and may not need to purchase a ticket if they’re accompanied by an adult who has purchased a lift ticket.
However, some resorts might have special rules for very small children, so it’s always best to check with the specific resort’s policies before visiting. If you do need to buy tickets for your little one, it’s usually possible to do so either online or at the scene (at the ski resort on the day of visit).
As for kids taller than 1.4 meters, they are typically considered adults and would need to purchase an adult lift ticket.
Please note that these rules might vary depending on the specific ski resort you plan to visit in China.