halacha - If a woman converts to Judaism while pregnant, will her child be a Jew?

If a woman converts to Judaism while pregnant, will her child be a Jew once born?

Answer

Yes (Yevamos 78a, Bechoros 46a), the child is completely Jewish. However, slightly different Halachos may be applied in some cases. (For example, whether the child can marry a Kohen.)

There is also a dispute over whether the fetus is considered a part of its mother or not, and therefore, whether the child was born Jewish, or is considered to have converted with its mother.