Is the birth certificate issued by Consulate Office a valid proof?

The USCIS relies upon the U.S. Department of State to identify the birth records that will be satisfactory for immigration application purposes. The U.S. Department of State identifies acceptable documents according to the country of birth, the town or similar jurisdiction of birth within the specified country, and the date of birth. Failing to supply the documents designated by the U.S. Department of State can cause significant application adjudication delays or even may result in an application's denial. There really is no substitute for consulting with an immigration attorney who, after learning all of the relevant information, could advise about acceptable birth records, advise about eligibilities, options and strategies to attain your goals, and offer legal representation in the often complex application process.