According to the latest CDC guidance, 9-month-old babies must receive multiple doses of an unlicensed mRNA COVID-19 vaccine to be considered “up to date” with their COVID-19 vaccination.

If getting the new Pfizer shot, the baby is supposed to receive the first dose at 6 months, the second dose three weeks later and the third dose at least eight weeks after the second dose — meaning, that by 9 months old, babies are supposed to have received three Pfizer shots.

If getting the latest Moderna shot, the CDC recommends babies get the first dose at age 6 months and the second dose a month later.

The latest Pfizer and Moderna COVID-19 shots for children under 12 are unlicensed in the U.S. The U.S. Food and Drug Administration (FDA) has granted only emergency use authorization (EUA) for the vaccines.

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