CDC recommends 1 updated booster dose:
There is no booster recommendation for children aged 6 months–4 years who got the Pfizer-BioNTech COVID-19 vaccine primary series.
If you had Pfizer or Moderna as your primary vaccine, it must be 5 months since your second dose. If you had Janssen/Johnson & Johnson as your primary vaccine, it must be 2 months since your original dose. You may chose a different manufacturer for your booster dose if you prefer.
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