In this paranoid age of child predators and identity thefts, wouldn't it be better to keep a picture of your child on the bike, and a record of the s/n? I'd be worried that a bike thief would be interested in my information and identity after finding it accidentally, or because they've heard this tip. Maybe I'm paranoid, but I'd rather the "authorities" or my insurance company know the details and be able to prove it in that manner....

Just my 2 cents worth.

Hugs and butterflies,
~T~