Australian here. Until I read this blog - http://pancakesandfrenchfries.com/2009/11/halloween-not-my-favorite/ - a couple of years ago I had never considered that parents would expect goodies for infants. Or that people would expect something for not dressing up.
Sigh. I really, really don't get the nasty holier-than-thou attitudes of the TOT police.
Just to remind everyone - Trick or Treat is NOT a request or cutesy saying. It is a subtle demand. Either give them a treat or you might get a trick played on you. That's the basis of Halloween as far as the history of trick-or-treating in the United States (who started this whole phenomenon). Because what is Halloween without a bit of menace? :D
You can decide if you do or do not want to supply candy - just turn off the porch light and pretend you're not home and hope the little goblins don't egg your house. Or you can stop being a stick in the mud jerkface, imposing your personal judgements and making people feel bad about asking for a few pennies' worth of candy on a night where TOT'ers can be wild and crazy kids (no matter how old they might be on the outside).
Don't we all get judged enough in real life? Is it really worth it to act smug or superior to that poor teenaged kid with no costume that really, really just wanted to run around at night and collect candy and remember for a little while what it feels like to be a happy kid again? Or that parent that was so happy their little one is here and looks adorable in their little costume they had to hit a few houses to commemorate their first Halloween?
I give candy to all comers - little kids that are too afraid to come up the driveway get curbside service, babies asleep in strollers pushed by proud parents, adults, or teens in no costumes. If they say the magic words, they get candy and a "Happy Halloween!" at my house. Because I care about creating nice memories for all, and making my neighbors feel like maybe just for a few minutes, the old-fashioned close-knit neighborhood that cared about each other still exists for at least that one night.
/soapbox