One and a half year old babies have been vaccinated with a variety of vaccines including polio vaccine, DPT vaccine, live attenuated hepatitis A vaccine and so on. Polio vaccine: you can receive the fourth dose of polio vaccine, which completes the full immunization of polio vaccination and can be used to prevent polio. DPT vaccine: the fourth dose of DPT vaccine can be given to complete the full immunization of DPT vaccination, which can be used to prevent whooping cough, diphtheria, tetanus and other diseases. Hepatitis A Vaccine: The first dose of Hepatitis A Vaccine can be given to prevent Hepatitis A. It can also be used to prevent chickenpox vaccine. Meanwhile, chickenpox vaccine, influenza vaccine, rotavirus vaccine, EV71 vaccine can also be given to prevent the occurrence of related infectious diseases. Please refer to your local doctor for the specific vaccination schedule.