The Pentavalent vaccine can be given in both arms and legs. The Pentavalent vaccine is a combination vaccine, which refers to the acellular DPT vaccine, inactivated polio vaccine, and Haemophilus influenzae type B (Hib) vaccine, and is usually given in infancy and early childhood. These vaccines can be given in the arms and legs. The Pentavalent vaccine is more important as it is effective in preventing diphtheria, tetanus, whooping cough, and Haemophilus influenzae type b infections. After vaccination, parents should take their children to observe at the vaccination site for 30 minutes to make sure there is no abnormality before leaving. Secondly, if there are adverse reactions such as fever, vomiting and crying at a later stage, you can consult a doctor as soon as possible. The Pentavalent vaccine is a common vaccine, and parents are advised to understand the effects, adverse reactions and contraindications of the vaccine before vaccination.