How do you say what month were born in Japanese?

There are a few ways to ask "What month were you born in?" in Japanese, depending on the level of formality:

* 何月生まれですか？ (Nan-gatsu umare desu ka?) This is a polite and common way to ask. It literally translates to "What month's birth is it?"

* 何月生まれ？ (Nan-gatsu umare?) This is a less formal version, suitable for friends or family. The question mark is implied in the intonation.

* 生まれたのは何月ですか？ (Umareta no wa nan-gatsu desu ka?) This is a more formal and slightly longer way to ask, meaning "What month were you born?"

Remember to use the appropriate polite ending (です - desu) when speaking to someone you don't know well or are of a higher social standing. You can omit the です in informal settings.