你从医院拿到的才是“副本”（souvenir certificate），正式的出生纸需要申请，在加州要付费$29。

https://www.allinahealth.org/health-conditions-and-treatments/health-library/patient-education/beginnings/your-hospital-stay/you-and-your-baby/your-babys-birth-certificate-and-social-security-number