No. A passport is absolutely required.
No. Age has nothing to do with travel. Everyone no matter their age needs a passport.
As a US citizen he can travel anywhere in the US he wants without a passport. If he wants to go to Mexico, Canada, Carribean or Bahamas then at the very least he needs is a passport card. Anywhere else in the world and the very least he needs is a full passport. Depending on where he goes he may need a tourist Visa as well as a passport.
Is it allowed to travel around the world with the world passport?
If that travel document is a passport then yes you can. Without passport it wont be possible
No if she has a passport she could travel anywhere without a USA passport
no
A passport is basically your identification document allowing you to travel to other countries - without it, you can't cross international borders.
If you wish to travel internationally, you need a passport, no matter the circumstances.
No, your baby can't. Nobody can travel without a passport, and it makes no difference how old he is, or the destination.
Anywhere withing a country that your in.
Not if you are a US citizen. If you are a citizen of the country, you can travel to any place part of the country without a passport.