Full disclosure: I know the designer/screenprinter behind the new Etsy site fauxsure, and the above photo is of my son Devin wearing one of fauxsure's designs. Yes, Devin looks super cute in his monster onesie, and your kid can too for just $16.50. We've even taken to calling him Devin-monster when in this outfit.
If your tastes run more towards the electronic end of the spectrum, you'll want to check out the speaker stack onesie or lap T, which is hopefully not a sign of volumes to come. And as a bonus on fauxsure's Etsy site, when you buy three T-shirts (maybe pick one up for yourself in an adult size), you get a tote bag free. Totally rad. And I have it on good authority that new designs are coming soon.