12 hundred children in the UK are born with a cleft lip or palate every year. Little is known about what causes it.
To help provide some definitive answers, the world's biggest ever research programme into the condition has been launched, with Bristol experts leading the project.
More top news
It will be cloudy and mild with some brightness today but rain will move in overnight, becoming heavier tomorrow afternoon.
Tennis star Pat Cash, TV presenter Kevin McCloud and Bristol Mayor George Ferguson have helped plant a community orchard in Bristol.
Bob Crampton has the Thursday weather.