“Congenital Heart Disease (CHDs) are present at birth and can affect the structure of a baby’s heart and the way it works. They can affect how blood flows through the heart and out to the rest of the body. CHDs can vary from mild (such as a small hole in the heart) to severe (such as missing or poorly formed parts of the heart).About 1 in 4 babies born with a heart defect has a critical CHD (also known as critical congenital heart disease).”