What is the latest age in months for the first dose of oral rotavirus vaccine?

The first dose of the oral rotavirus vaccine should be administered no later than before the baby reaches 6 months of age. This vaccine primarily prevents diarrhea in infants and young children caused by rotavirus infection. Timely vaccination provides early protection for babies and reduces the risk of severe illness. If the baby has not been vaccinated after 6 months or if there are concerns regarding contraindications, it is recommended to seek medical advice promptly.

Rotavirus infection is most common in infants and young children aged 6 months to 2 years. After 6 months, the maternal antibodies passed to the baby gradually decline, increasing the risk of infection. Therefore, completing the first dose before 6 months ensures continuous protection. Vaccination must follow the recommended immunization schedule; delaying the first dose may affect the timing of subsequent doses and reduce overall protective efficacy.

Different types of oral rotavirus vaccines have slightly different immunization schedules, but all require initiation within 6 months of age. Some vaccines require a second dose 4–10 weeks after the first. Full vaccination can provide protection for approximately one year. For those who miss the vaccination window, a healthcare provider should assess whether vaccination is still possible or whether alternative preventive measures are needed.

Prior to vaccination, ensure the baby is in good health without fever, diarrhea, or other discomforts. Observe the baby for 30 minutes after vaccination. Offer small amounts of warm water during this time, avoid feeding hot food or engaging in vigorous activity immediately afterward, maintain a light diet, and monitor the baby's mental state and bowel movements to support optimal vaccine effectiveness.