Blue Babies

Blue babies are blue because they do not have only oxygenated blood - which is bright red following circulation round the lungs going around the body, but also deoxygenated blood which is blue. The two major causes of this are developmental abnormalities in the formation of the heart, in one of which there are several abnormalities, together called the Tetralogy of Fallot, while in the other the major vessels have been transposed.
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