Study of Concomitant Administration of the sIPV and DTaP or MMR

Inclusion Criteria: * Age Requirement: Infants aged 2 months at the time of enrollment * Provision of Legal Identification: Volunteers and their legal guardians or appointed representatives must provide valid legal identification documents. * Informed Consent: Legal guardians or appointed representatives of volunteers must have the capacity to understand the informed consent document and the research process, voluntarily participate, and sign the informed consent form. * Adherence: Legal guardians or appointed representatives of volunteers must be able to comply with the requirements in the study as well as complete relevant visits on time. * Birth Condition: Full-term at birth (gestational age ≥ 37 weeks and \< 42 weeks) and birth weight ≥ 2500g Exclusion Criteria: * Vaccination History: received vaccines containing diphtheria-tetanus-pertussis antigens, polio antigens, Hib conjugate vaccine, or 13-valent pneumococcal conjugate vaccine before enrollment. * Those who had received blood transfusions or used blood products (except hepatitis B immunoglobulin) before enrollment. * Recent Vaccination: Volunteers received any inactivated vaccines or subunit vaccines within 7 days (including the 7th day) prior to vaccination with the investigational vaccine, or any other live attenuated vaccines within 14 days (including the 14th day) prior to vaccination. * Acute Illness: Volunteers have experienced acute illnesses (e.g., fever) within 3 days before enrollment, or have used anti…