This inherited condition affects digestion and the ability of the lungs to work properly. Babies with CF have problems digesting food and may not gain weight well. They are also more likely to have frequent chest infections.
 
Between 12 and 14 babies in Wales are born with CF each year.
 
Newborn bloodspot screening means that babies with CF can be identified and treated early with a high-energy diet, medicines and physiotherapy. Early treatment is thought to help children with CF live longer, healthier lives. If babies are not screened for CF and they do have the condition, they can be tested later, but parents may have an anxious and uncertain time before CF is diagnosed.