A congenital heart defect, also referred to as congenital heart disease or CHD, is a heart problem that is present at birth and is caused by an error in the development of the heart during fetal development.n most cases when a baby is born with a congenital heart defect, there is no known reason for the heart to have formed incorrectly. Scientists know that some types of congenital heart defects can be related to an abnormality of an infant's chromosomes, single gene defects or environmental factors.
Other complications of the flu that can affect children are: 1  Convulsions caused by fever. 2  Croup. 3  Ear infections, such as otitis media.
Flu (influenza, conventional, H1N1, H3N2, and bird flu [H5N1]) facts. 1  Influenza, commonly called the flu, is caused by viruses that infect the respiratory tract. 2  Flu symptoms include fever, chills, cough, sore throat, headache, muscle aches, and. fatigue. 3  The incubation period for flu is about one to four days.