Still about the marriage and birth certificates

Thanks Allen. Just to clarify: Once I have the marriage and birth certificates notarized by a Notary Public I then have to have them authenticated by the Depts of Foreign Affairs and Trade, and then have the documents authenticated by the Chinese Consular-General. OR...did you mean that I have the certificates authenticated either by the Depts of Foreign Affairs and Trade or the Chinese Consular-General. Many thanks Jan