Jamie and Rachael Bonser are campaigning for hospitals to check for a condition at every pregnant woman's 20-week scan.
The condition is called Vasa Praevia and is caused by the placental or umbilical blood vessels crossing the birth canal.
It is not mandatory for hospitals to check for the condition.
A full list of the symptoms and what to do about them is available here.
More top news
Parents of any child found to be out of school without a valid reason could be issued with a £60 fixed penalty notice EACH today.
Patients in Lincoln are being given the opportunity to consult with hospital staff on the phone for the first time.
Two years after a pensioner was stabbed to death at his home in Northampton, police have made a new appeal to catch his killers.