The birth permit is issued by the local family planning station. You should apply for it in Chongqing Express, and you should see it in Chongqing Express Family Planning Station.
Information required for birth certificate: 1, marriage certificate, household registration book and a recent bareheaded photo of myself; 2. Marriage and childbirth certificate issued by villagers or residents' committees or units; 3, "family planning service certificate" or "floating population marriage certificate"; 4, has given birth to children, should be submitted by the family planning department issued proof of contraceptive measures.