Apple have said that cases such at Danny Kitchen's must be reported as quickly as possible. They say it is vital people kept their pass code - which is designed to stop unauthorised electronic purchases on its products - safe.
– Apple spokesman
All iOS devices have built in parental controls that give parents and guardians the ability to restrict access to content, eg internet access and age rated content such as music, games, apps, TV shows, movies etc.
Parental controls also give parents and guardians the option to turn off functionality such as purchasing from iTunes and the ability to turn off in-app purchases.
More information on how to restrict child accesses to devices can be found here.