Which document is NOT a requirement for proving U.S. citizenship if born in the U.S.?

The correct choice indicates that a current tax return is not a requirement for proving U.S. citizenship if born in the U.S. Citizenship can be proven using documentation that typically includes evidence of birth within the United States, such as a birth certificate or other similar legal documents.

Pediatric care records, early school records, and baptismal certificates can provide supporting documentation. These documents often contain information that helps establish the birthplace and identity of individuals, which are crucial in proving citizenship by birth. In contrast, a current tax return does not serve this purpose, as it is primarily a financial document that reflects income tax filings and does not provide definitive proof of citizenship status.

Therefore, a current tax return is not an appropriate or necessary document for demonstrating U.S. citizenship under these circumstances.