Why do babies' eyes change color? - Big Questions - (Ep. 211)

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eye   color   change   beauty   child   baby   toddler   blue   green   hazel   brown   science   health   optometry-medical-specialty   infant   medicine   craig-benzine   wheezy-waiter   mental-floss   john-green   iris   pupil   colour   newborn   trivia   fun   interesting   smart   knowledge