Originally Posted by
MSPeconomist
It's a renewal, not a first USA passport. With proof of immediate travel (usually within two weeks, longer if one needs to apply for visas), a passport agency will issue the new passport in person the next day and sometimes the same day (for example, for emergency travel).
Of course, it never hurts to bring excess documents with you, so the parents would be wise to bring the birth certificate if they have one.
I understand and have done this several times - but I understand there is no way to make an appointment and no walk-ins at the moment due to staffing issues. They might make an exception for an early morning walk-in but I doubt it and best plan for the worst.