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Вот вам, к примеру, американский кайч-ап календарь (см 2 стр графики и 3 стр примечание №2):
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Rotavirus (RV) vaccines. (Minimum age: 6 weeks for both
RV1 [Rotarix] and RV5 [RotaTeq])
Routine vaccination:
Administer a series of RV vaccine to all infants as follows:
1. If Rotarix is used, administer a 2-dose series at ages 2
and 4 months.
2. If RotaTeq is used, administer a 3-dose series at ages 2,
4, and 6 months.
3. If any dose in the series was RotaTeq or vaccine product
is unknown for any dose in the series, a total of 3 doses
of RV vaccine should be administered.
Catch-up vaccination:
• The maximum age for the first dose in the series is 14
weeks, 6 days; vaccination should not be initiated for
infants aged 15 weeks, 0 days, or older.
• The maximum age for the final dose in the series is 8
months, 0 days.
• For other catch-up guidance, see Figure 2