One of the items purported to be practical is the BugBite Teether. Consider their justification:
When babies are born, they really can't defend themselves from zombie invasion. About all they can do is hope that their brains are small enough to not be noticed in the teeming hordes of screaming adult humans. If that fails, they need to hope their supersonic screaming drives away the zombies. Luckily, at about six months, babies start to get teeth, giving them a line of defense. It's important for parents to encourage their baby to use these shiny white weapons by giving them a teether.
It's an interesting argument. By "interesting" I mean completely silly. The irony of using biting against zombies who are famous and fearsome for biting is not lost on me. Also not lost on me is the fact that biting a zombie seems just as likely to turn the biter into a zombie. It all comes down to the mechanics of the zombie epidemic. If a voodoo curse or death has to occur before one can become a zombie, then the little biter would be okay. But if a virus or some such biological contaminate causes zombification, then your setting your child up for failure. And no one wants their child to be a failure, do they?
We have not purchased this product, so I can't comment on the quality or durability of the construction. Or how tasty it is. So I can't recommend or not recommend the teether. But don't think this is a panacea for the inevitable zombie apocalypse.
Maybe they should make some sort of teether that tastes like brains that you can throw at zombies to distract them while you make your escape. Hopefully they'd be sold in multipacks. Or the teethers could be so attractive that the zombies fight over the teether rather than mobbing you. I'll have to look for a suggestion box on their web site.