是的，寄到MD secretary of state去申请认证。

Guide to authenticate Maryland birth certificate. 

https://www.montgomerycountymd.gov/cct/Resources/Files/law-library/Apostille-Standard-Certification-Guide.pdf

Official Documents Issued by the State or a County in Maryland: Documents that are issued by a Maryland state or county official and have a seal and authorized signature can be taken directly to the Maryland Office of the Secretary of State in Annapolis for certification – without first being notarized. Examples of these documents are: birth or death certificates, motor ...

认证以后，到中国大使馆做领事认证。

洛杉矶的领事馆认证手续见内。

http://losangeles.china-consulate.gov.cn/eng/visa/chinaauthen/201703/t20170325_5421843.htm