Because he is a third child, which is against the law unless you have specific permission from the government, and too many children is seen as excessive and ultra-religious in that society, which is frowned upon.
Andrew 'Ender' Wiggin is referred to as **'the Third' **in 'Ender's Game' due to special circumstantial exceptions in his society's population control that allowed his parents to have a third child. ;
Andrew Wiggin is called "the Third" because he is the third child in a society that restricts families to two children. His status as a Third alienates him from others and shapes his experiences throughout the story. This designation reflects the societal norms and restrictions of the world in which he lives.
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