I have posted this info on previous threads. Remember to check everything is working ok from time to time and especially after any updates . Bet your son is very happy 
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Just in case anyone's interested I posted the following on a recent thread on IPad security. It's for iOS7 (ie the latest IPads).
FOR iOS7
THE BASICS FOR STOPPING UNINTENTIONAL IN-APP PURCHASES
-
keep your iTunes password private and not guess'able
-
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.
PREVENTING CHILDREN FROM BEING ABLE TO DELETE THEIR BROWSING HISTORY . (I love this feature)
SETTINGS >>>> GENERAL. >>> RESTRICTIONS >>> your PIN NUMBER >>>> WEBSITES >>> then tick LIMIT ADULT CONTENT
This removes the option to delete the history of which websites your child has visited. For younger children you can specify which websites you DC can visit and prevent them from visiting any other sites at all. You can find this option by doing the following
SETTINGS >>>> GENERAL. >>> RESTRICTIONS >>> your PIN NUMBER >>>> WEBSITES >>> then tick SPECIFIC WEBSITES ONLY this will allow you to specify which websites can and can't be visited.
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.