A four-year-old girl will hear her loved ones sing "Happy Birthday" to her today for the first time in her life, thanks to pioneering hearing surgery by a team of doctors from Guy's and St Thomas' Hospital and Kings College Hospital.
Leia Armitage, who turns four today, was born with a rare form of deafness as she was missing her cochlea, and the auditory nerve in both ears through which sound reaches the brain.
She underwent pioneering surgery to have an auditory brainstem implant (ABI) two years ago and has just returned to St Thomas' Hospital in central London to have her final check up - where doctors confirmed the procedure was a success.
The complexity of her condition means that it has taken time for her brain to adapt to be able to hear sound, and she is just learning to form her own speech.
The electronic hearing device stimulates neurons directly at the brainstem, bypassing the cochlea and auditory nerve entirely. ABIs are normally used for adults who have lost the auditory nerve through severe injury of by removal of a brain tumour - it is only recently that ABIs have been trialed on children.
Professor Dan Jiang, one of three surgeons involved in the operation and head of the Hearing Implant Centre at St Thomas' Hospital, said:
Leia is one of the youngest people in the UK to undergo the pioneering surgical technique, and her father Bob said it has transformed all of their lives.
Leia's mother Alison said she wants other parents to know that there are options available for children born with complex deafness, and is incredibly grateful for the level of care her child received.