The Midwich Cuckoos: The Mini-Series DVD

One evening everyone in a part of the English town of Midwich falls unconscious, and upon waking, every woman has fallen pregnant. As these women give birth, Midwich begins to realise these children are unlike any other. Each child resembles their mother. They have their mother's DNA, but with alien additions. And some male, implying a Y chromosome. The government takes an immediate interest and imposes secrecy, paying the parents for their cooperation.