[onetwo_threefour]

When I do these for clients I do get pretty specific so as to give as much info as a paranoid border guard might want.

Itinerary - Dates of travel - Accompanied by whom - Where staying at destination and with whom - Consent for accompanying person to authorize medical care for the minor.
Include passport #'s and names for both parents and the child as well.

It's not rocket science, but the more official it looks, the less likely you will have a problem.