Because, according to Wikipedia, the actor who played Ruby's voice was originally Samantha Morgan. In season 3, she was replaced by Rebecca Peters.
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Samantha Morton did Ruby's voice in seasons one and two. In seasons four and three Rebbecca Peters does her voice.
And Rebbecca will probably continue for season five!
Max and Ruby... They're brother and sister.
Max and Ruby - 2002 Hide and Seek Max's Breakfast Louise's Secret 1-2 was released on: USA: September 2002
Max is still developing his speech, so he has a limited vocabulary.
May 2, 2002
Max and Ruby - 2002 Surprise Skate Tent was released on: USA: 3 June 2003