Is 16 Cm too big for a 12 year old?

It depends on the context. If you're referring to 16 cm in terms of height, that's relatively short for a 12-year-old, as average heights vary by region and gender. If it's about a specific item or measurement, such as a toy or clothing, it might be considered large or appropriate based on individual preferences. Always consider the specific situation when determining if something is "too big."