CDC expanded its recommendation to allow children ages 6 months through 4 years who previously completed the full 3-dose monovalent Pfizer COVID-19 primary vaccination series to now receive a booster dose of Pfizer’s updated bivalent COVID-19 vaccine. This update only applies to the children who have completed the Pfizer monovalent 3-dose primary series.

The vast majority of children in this age group have not received any doses of a COVID-19 vaccine and the update means all children in this age group are eligible to receive an updated vaccine, either through completion of their primary series or through a booster dose.