In children’s preventive vaccination, children will be vaccinated with DPT vaccine and polio vaccine, and both vaccines, in principle, can be administered at the same time. Like the commonly used DPT4-5 vaccine, it actually contains both DPT and polio vaccines at the same time. For babies, the application of quadruple and pentavalent vaccines can reduce the number of injections for babies, and at the same time, it is also of great benefit to alleviate vaccine reactions, so if parents can accept the price, they can consider receiving pentavalent or quadruple vaccines. Of course there is no problem if they are vaccinated separately and at the same time.