A New York Letter to Amend Birth Certificate is a document used to make changes to an existing birth certificate. It is typically used to update incorrect information, such as a wrong name, gender, or date of birth. This letter is issued by the New York State Department of Health and must be signed by a parent or legal guardian. It must also include the child's full name, date of birth, and the change that needs to be made. There are two main types of New York Letter to Amend Birth Certificate: a Correction Letter and an Acknowledgement of Paternity Letter. The Correction Letter is used to make changes to the existing birth certificate, while the Acknowledgement of Paternity Letter is used to add a father's name to the birth certificate.