Polio refers to polio vaccine, while Pentavalent refers to five doses of vaccine, which is a combined vaccine that can be given at an interval of 28 days after a free dose of polio vaccine. Polio vaccine is mainly used to prevent polio, while pentavalent refers to the inactivated polio vaccine, acellular pertussis vaccine, and Haemophilus influenzae type B vaccine, which is a combined vaccine. Usually, after a baby has received a free polio vaccine, he/she can receive the DPT vaccine 28 days later, which is generally conflict-free and harmless to the body. Some babies may have adverse reactions such as fever, redness and swelling at the injection site after vaccination with DPT5, while special groups such as those who are allergic to the vaccine, in the period of fever or acute illnesses are not allowed to receive DPT5 to avoid accidents. It is recommended that people in need of vaccination should consult regular hospitals for DPT vaccination, and strengthen skin care at the injection site after vaccination to avoid friction and stimulation by foreign objects and prevent infection.