Verification / Legalization Of Birth Certificate

Me and my son (one and half year old) would like to apply for a family union visa for Linz as my husband have got a full time employment in Linz, Austria.

My son was born in Beijing, China and he has an original birth certificate issued from China (attached herein). My son has a Pakistani Passport. Currently me and my family are living in Pakistan.

I would like to know whether your Consular Department of Chinese Foreign Ministry verify/legalize the birth certificate of my son .