My mom got my ears pierced really young and then again when I was about 5 when the first ones closed up. This was back when you went to a department store when they offered ear piercing and they had a nurse who used a needle or needle punch thingy, not these new-fangled, fancy earring guns. Then they went after your ear to put in the earring after punching in the hole. Who else remembers this, ya' dinosaurs?
I thought of earrings because you don't have to worry about size and her growing. Simple studs (birthstone, cubic zirconium, gold balls) can be useful and last a really long time.
A bracelet is a really great idea. She will always remember the experience and remember where the bracelet came from, and will remember you and (soon to be) DH, even if you part ways over time. It will always be very special. My advice would be to choose a bracelet with larger ringlets or chain so that the clasp can be used in any ringlet to fit her tiny wrist and be large enough to use as she grows. Something like a fishbone kinks too easily for a rough and tumble little girl and has to be more size-specific. Tiny links can be easily resolved with a safety pin for the ceremony and special occasions and something that can last a lifetime when she's finally big enough she can use the clasp
. Whatever you choose and your ideas sound great and the suggestions sounds great! I'm just tossing out some things to think about if you choose a bracelet.