A critically ill Victorian mother has woken from a coma months after she was struck with the flu, unaware she had given birth.

Sarah Hawthorn, 33, was otherwise fit and healthy when she was struck down by the influenza epidemic gripping the country in the late stages of her pregnancy.

Sarah Hawthorn, 33, was an otherwise healthy and fit woman when she was struck down by the influenza epidemic sweeping the country in the late stages of her pregnancy.

Ms Hawthorn's son was delivered five weeks premature during an emergency birth on August 28.

Her family said at the time that she was unaware she had given birth to "the most perfect little baby boy".