A girl got the surprise of her life when she woke up for school one morning to find her baby sister had been born overnight.

Nine-year-old Honey Heycock was completely unaware of her mother giving birth while she slept.

Mum Stephanie Heycock, 34, had seventh child, Willow Heycock, on May 7 in an unplanned homebirth.

Honey, who was eight at the time, was asleep and completely unaware of her mum giving birth.

The next morning, Honey woke up for school and came into her mum's room to say good morning but instead found quite the surprise.