This is how Naruto appears in the sequel; 'Naruto Shippuden' Series.
When designing Naruto for his Part II appearance, Kishimoto drew Naruto's forehead-protector wider to make his eyebrows easier to draw, something that had bothered him in his previous design. He also noted that Naruto's pants made the character look too childish. To remedy this, Kishimoto designed Naruto's pants to roll up, giving him a more mature appearance.

Source:Wikipedia