Title is correct. "Foreign", in terms of language, is a language not spoken typically in one's home country. Now, a home country only applies to a person after

Title is correct. "Foreign", in terms of language, is a language not spoken typically in one's home country. Now, a home country only applies to a person after they've been born, which is not the case of the subjects of the article. But still, we can give a bit of leeway to the author, and just presume the home country of the unborn child, and so, interpret the concept of a "foreign language" correctly.