iPod Touch 5th gen pass code

My 7 year old daughter got hold of my son's brand new iPod Touch, which I hadn't even set up yet, and managed to add a pass code, I'm assuming on the initial setup screen. 

 

I've tried a restore while plugging it into iTunes, but iTunes continues to tell me it needs the pass code. 

 

Please help, what do I need to do?  Should I make an appointment with the apple store?

 

I realise there is a lot of theft regarding these things.  This is a genuine query.

 

Thanks in advance.

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