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How long can parents stay when their daughter gives birth in America?

180 days. My daughter gave birth in the United States, and her immediate family took care of her in the past, so she needed to apply for a B visa to visit her relatives. The longest stay in the United States for a B visa is 180 days. The United States, the full name of the United States of America, is a constitutional federal republic consisting of fifty states and a federal special administrative region.