You should have a read of THIS THREAD

I posted the following info on it. It might not be 100% relevant but hopefully it's of some use. I am sure you already know most of it but I thought it better to be thorough on the other thread 
FOR iOS7
THE BASICS FOR STOPPING UNINTENTIONAL IN-APP PURCHASES
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keep your iTunes password private and not guess'able
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Enable restrictions
SETTINGS >>>> GENERAL. >>> RESTRICTIONS >>> then enter and re-enter a non-guessable 4 digit PIN number.
3). Then turn off in-app purchases
SETTINGS >>>> GENERAL. >>> RESTRICTIONS >>> your PIN NUMBER >>>>. Turn off IN-APP PURCHASES
- Require a password every time you make an iTunes purchase. This is your Apple ID password.
SETTINGS >>>> GENERAL. >>> RESTRICTIONS >>> your PIN NUMBER >>>> REQUIRE PASSWORD >>>> toggle it to IMMEDIATELY
5). Remove your credit card from your iTunes account and use itunes vouchers.
- turn off autofill and credit card info
SETTINGS >>> SAFARI >>> PASSWORDS AND AUTOFILL >> toggle off NAMES AND PASSWORDS AND turn off CREDIT CARDS
BLOCKING ADULT WEB CONTENT (ie porn 'n stuff)
Even if you have decent controls on your home network and it's worth following the info in the following THIS LINK This feature is even more important if your child has a 3G device or accesses the internet via networks with no controls.
PRIVACY
I recommend that anyone who is concerned about privacy and has Apple devices running iOS7 have a look at THIS LINK . It details how you can prevent pesky Apple and other apps accessing information about you.
Disclaimer, I am happy to have the above info corrected. I think its right but I am not at all an expert
This info is for iOS7 only.