Originally Posted by Bago'peanuts

Good info! Thanks everyone for your input. Seems best to call, since the agent will probably let me know if there is a problem.

I wasn't aware that a young child could have their own reservation -- I had assumed that the "system" would prevent that from being booked without, for example, pay the 'unaccompanied child' fee at the same time. Going forward, that would seem the best way to go, assuming that planning for extra time at the airport for stopping at the counter instead of checking in online isn't a hassle.