When should premature babies receive vaccines?

What does the evidence say about vaccines for premature babies?

1. For most routine immunizations, a stable preterm infant follows the same chronological schedule as a full-term infant. Small size by itself is not a reason to delay every vaccine. Corrected age used for developmental milestones should not automatically move vaccination appointments. 1
2. Premature infants can face greater complications from infections that routine childhood vaccines address. Discuss individual contraindications or current illness with the pediatrician, while avoiding a blanket assumption that a baby must catch up in size before starting the schedule. 2
3. Hepatitis B is an important exception to a simple age-only rule. Birth weight and maternal HBsAg status determine timing and whether hepatitis B immune globulin is needed. If the birth parent has hepatitis B, prompt newborn prophylaxis is important even in a very small infant. 3
4. Use the recommended vaccine dose rather than a reduced or divided dose because the baby was born early. A prolonged NICU stay also needs a plan for vaccines with age limits, including rotavirus. The hospital and outpatient teams should coordinate before a window is missed. 1
5. Infant DTaP doses form a series, so one visit does not complete protection against pertussis and the other included infections. Keep a dated immunization record and confirm the next appointment. Maternal Tdap during pregnancy does not replace the infant’s own recommended series. 4

Keeping hospital and pediatric records aligned

• Use the birth date for routine vaccine timing unless the clinician specifies an exception.
• Confirm the hepatitis B plan using birth weight and maternal test results.
• Bring the NICU immunization record to follow-up and schedule the next due visit.