I don’t like to admit it, but I see a celebrity and they have such a lovely accessory on their kid, and I can’t help but be compelled to buy it. This was one such purchase. Above are sterling silver ankle bangles. They have two little bells that are soldered on to an adjustable ring...so when your little one starts walking you hear a faint little jingle. They are very popular with Asian cultures so I wouldn't be surprised if you could find them in a upscale Asian or Indian jewelry shop.
I have no idea where you might find them in the Bay Area...I bought mine off eBay for about $10. baby emi also has beautiful heirloom quality versions of them, but they are a bit pricier.