We have a newborn in the house and what got me thinking about an infant ID was the fact that the hospital maternity ward required both parents and baby be wrist-banded for positvie idetification and/or admission to the ward itself. In addition, the babies had an ankle device attached that sounded alarms if the baby was near an exit from the ward itself. Infant child abduction is a bigger problem than I had realized.
But after you leave the hospital you wat for about 2-3 weeks for a birth certicate which still won't be a photo ID. Unless you apply for a US passport for your baby, or go to your state MVD and get the state-issued version, the only solution is to make your own. Some websites like mypreciouskid.com offer these, but I understand some law enforcement agencies issue "Baby ID Kits" as well.
Having said all that, we travelled extensively on Amtrak last summer with our 15-yr old daughter, with her reduced price ticket, and no ID whatsoever to prove her age. And we were never asked for any. I know the airlines require birth certificates or US passports for (lap) babies under 2, but, apparently, Amtrak takes your word for it.
Edited by rusty spike, 17 February 2013 - 01:07 PM.