An AE was any untoward medical occurrence in a clinical investigation participant administered a medicinal product and which did not have any causal relationship with the treatment. An unsolicited AE was an observed AE that did not fulfill the conditions prelisted in the case report book (CRB) in terms of diagnosis and/or onset window post-vaccination. Immediate adverse events are unsolicited systemic adverse events occurring in the 30 minutes after injection. Reported AEs for each arm were presented as pre-specified in protocol.

A solicited reaction was an "expected" adverse reaction (AR) (sign or symptom) observed and reported under the conditions (nature and onset) pre-listed in the protocol and CRB and considered as related to the product administered. Solicited injection site reactions included Injection site tenderness, Injection site erythema, and Injection site swelling and were planned to be collected and reported for each vaccine separately; and not planned to be collected for Rotavirus vaccine as the vaccine was administered orally, and no injection site reactions were expected to occur. Reported AEs for each arm were presented as pre-specified in protocol.

A solicited reaction was an "expected" AR (sign or symptom) observed and reported under the conditions (nature and onset) pre-listed in the protocol and CRB and considered as related to the product administered. Solicited systemic reactions included fever, vomiting, crying abnormal, drowsiness, appetite loss, and irritability. Reported AEs for each arm were presented as pre-specified in protocol.

An AE was any untoward medical occurrence in a clinical investigation participant administered a medicinal product, and which does not necessarily have a causal relationship with this treatment. An unsolicited AE was an observed AE that does not fulfill the conditions prelisted in the CRB in terms of diagnosis and/or onset window post-vaccination. Unsolicited AEs includes both serious adverse events (SAEs) and non-serious unsolicited AEs. Reported AEs for each arm were presented as pre-specified in protocol.

A SAE was any untoward medical occurrence that at any dose resulted in death, was life-threatening, required inpatient hospitalization or prolongation of existing hospitalization, resulted in persistent or significant disability/incapacity, was a congenital anomaly/birth defect, or was an important medical event. An AESI (serious or non-serious) was defined as one of scientific and medical concern specific to the Sponsor's product or program, for which ongoing monitoring and rapid communication by the Investigator to the Sponsor was appropriate. Reported AEs for each arm were presented as pre-specified in protocol.

A MAAE was defined as a new onset of a condition that prompts the participant or participant's parent/guardian to seek unplanned medical advice at a health care provider's office or Emergency Department. Reported AEs for each arm were presented as pre-specified in protocol.