I have no experience with the PPQ 22 but can tell you from my experience both owning and selling them, that the Walther P22 is notoriously finicky with ammo. (We get allot of complaints/returns at the shop.) Basically, if you can run ANYTHING but the factory recommended CCI Mini Mag, your doing good. Hopefully they have cured that with the PPQ flavor.
Do your research prior to buying yourself into a corner. ( Kids can eat ALLOT of ammo and Mini mAg can be both hard to find and expensive in comparison.)
As an alternative, the like designed Ruger SR 22's run on almost anything.
p.s Nice gifts!