Presumed Facts:
Child Name: Zod
Child Age: 2 years old
1) Zod was born to a US Citizen parent and non US Citizen Parent in a foreign country.
2) US Citizen parent meets all requirements to pass citizenship to child (US citizen parent lived in US for 10+ years after parent was 18, was married at time of child's birth, and child is under 18 years of age. All documents in order.
Visit to US Embassy
When Zod is 2 years old, the US Citizen parent takes the child to the US Embassy and fills out form DS-2029, (Application for Consular Report of Birth Abroad), since all requirements are met, the child would be considered a US Citizen. (At worst a DNA test would be asked for and passed).
Question:
What is the legal definition of the child's status prior to filing the Application for Consular Report of Birth Abroad, during the child's first two years of life in the eyes of the United States? (foreign national, US national, undocumented citizen... etc)?