A normal child with normal parents. I knew all my life that children were born by mothers, for me it was quite normal, calmly presented and therefore not a very interesting fact. Then I bought a previously inspected book on the matter. Why undermine his authority in a child with a sincere lie, for the naive exposition of which to other children he will be hardly mocked?
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Children cannot lie, even very young children. Well, how they are frightened: you will cry - uncle will take, you will touch the whisper - will fall. Sooner or later he will realize that this is a lie and will start to question other adult words.