Answer: precocious

AnswerCrossword Clue
PRECOCIOUSDescribing a child prodigy.
PRECOCIOUSLike a smart child
PRECOCIOUSExceptionally early
precocious(of a child) Having developed certain abilities or proclivities at an earlier age than usual
precociousexceptionally early in development or occurrence
precocious(of behavior or ability) Indicative of such development
precocious(of a plant) Flowering or fruiting earlier than usual