Baby’s nationality
Generally U.S. citizenship at birth; a narrow exception applies to children of certain accredited diplomats.
Generally, yes.
A baby born in Saipan (Commonwealth of the Northern Mariana Islands) on or after November 4, 1986 generally acquires U.S. citizenship at birth under Section 303 of the CNMI Covenant. Exceptions and changes in the law may affect individual cases. A child’s citizenship does not grant either parent a visa, green card or permission to enter the United States.

Generally U.S. citizenship at birth; a narrow exception applies to children of certain accredited diplomats.
An approved visa or travel authorization does not guarantee entry; CBP decides at the border.
A visitor visa cannot be issued when the primary purpose is giving birth to obtain U.S. citizenship for the child.
Certified birth record and U.S. passport are separate applications; return-entry rules depend on the destination.
The U.S. Department of State says that people born in the CNMI after November 3, 1986 acquire citizenship at birth under Covenant Section 303. It also requires appropriate evidence of birth. Foreign-diplomat exceptions and any later legal changes should be checked individually. Department of State ↗
Pregnancy is not itself a blanket ban on entry. However, CBP considers due date, planned stay, medical coverage, ability to pay and intention to depart. Be truthful about your purpose of travel. Medical treatment and birth tourism are not interchangeable visa purposes.
Ask the delivering hospital and CNMI vital-records office how to obtain a certified birth certificate; verify all names and spellings.
Check the U.S. Department of State’s under-16 instructions for DS-11, evidence of citizenship, parental relationship, identity, consent and in-person attendance.
Ask your country’s consulate and airline which nationality and entry documents apply to your baby. A U.S. passport alone may not resolve every destination-country question.
No, parental citizenship is generally not a requirement for birth in Saipan under the CNMI rule, but diplomatic exceptions and changes in law may matter.
No. A U.S. citizen generally must be at least 21 to petition for a parent, and approval is not automatic.
No. A certified birth certificate can be primary evidence of citizenship, but a passport requires a separate application and review.
No. The Department of State expressly identifies that purpose as impermissible for issuance of a visitor visa.
That depends on the relevant country’s nationality law, parental status and documentation rules. Verify with the relevant consular authority.