If they are not diagnosed early in life sometimes the consequences can be quite devastating.
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The flame-haired royal is an accomplished polo player but that didn't stop him taking a tumble not once, but twice, during the game.
A 24-year-old man has been arrested on suspicion of murder after the body washed up on the Thames shoreline.
Police were called to an address in Carlisle on Friday night but the eight-month-old died later in hospital.