I'd say send cupcakes for your child's birthday for sure, along with birthday hats.
Then, if you really want to do favor bags then send NON FOOD - no candy, food, etc. Send easy-on tattoos, stickers, a little plastic animal (if your child loves cats, send a little cat with each bag, if they love dinosaurs then send a dinosaur home in each bag).
Many parents DO NOT WANT candy to come home becuase then they need to fight/argue with their child about not eating it before dinner, etc.
And as a teacher, I didn't want to argue with kids all.day.long about how they could NOT have their gift bag until it went home. When it's stickers, a birthday hat and maybe a tiny little figurine, they were calmer about waiting until they got home to open their bag. BUT PLEASE - only do this is you an afford it.
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