Metathesis
This is the reversal of adjacent or close sounds (askbecomes aks) or sound sequences (spaghetti becomes pasketti) Another example of methathesis is the pronunciation of nuclear as nucular. This switch is very common among adults, including such famous persons as George W. Bush; so if your child does this, don't worry--he can still grow up to be the president of the United States! Former president Jimmy Carter also uses a nonstandard pronunciation that sounds more likenukia.