Do I need to apply for a new birth certificate to have a second child? In recent years, the country has opened up the two-child policy, and more and more couples have chosen to have a second child. In this case, many people will worry about whether they need to apply for a new birth certificate. Below we will elaborate on the concept, content, validity period and application procedures of the birth certificate. The concept of birth certificate. The birth certificate refers to the family planning work.