The best vaccine for children is the one that is available in the country. However, certain aspects should be considered for the choice of vaccine: number of doses to be applied: 2 versus 3, vaccine without diluent or with diluent among others; Delay the 2nd dose of Pfizer vaccine in children from 5 to 11 years of age until 8 weeks because immunity is improved by spacing the doses, reactogenicity such as pericarditis is reduced; Withdraw 3rd dose in children aged 6 to 11 years with inactivated COVID vaccine and administer mRNA vaccine as 3rd dose.