The word "宝贝" is formed by combining two characters, each contributing to the overall meaning of "treasure" or "darling". The first character, "宝", means "precious" or "treasure", often associated with valuable items. The second character, "贝", originally referred to cowrie shells used as currency in ancient China, thus also denoting value. Together, they create a compound word where both elements reinforce the idea of something highly valued, typically used to refer to a cherished person or object.