Upvote:4
The child will be considered as a US citizen and is required to take Pakistani visa.
Upvote:10
There are three different issues here:
The child in the example may well be a Pakistani citizen, with no easy way to prove it. Many countries fine airlines if they bring passengers without the necessary entry documents, so airlines do a check and they are usually not prepared to compare birth certificates or whatever -- they want to see a passport or national identity card.