What is the English spelling word for little brother in Chinese?

There isn't a single English word that directly translates to "little brother" in Chinese.

In Chinese, "little brother" is usually expressed as "弟弟" (dìdi).

However, the specific term used can vary depending on the context and the speaker's relationship with the younger brother. For instance, someone might use "younger brother" or "sibling" if they don't want to specify the age difference.