What if any additional papers are needed to bring a minor back into the US if they have a passport?

Question Details:

I'm a US citizen. I have a 4 year old son, who is also a US citizen. My son has been in Vietnam since for the last 2 years, since he was 22 months old. I now plan to bring him back to the states in about 7 months. I would like to know if he needs any legal papers in order to get back into the US besides a valid US passport and birth certificate?

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