US health officials on Tuesday gave the final approval to Pfizer's Covid-19 vaccine shot for children aged 5 to 11.
The Food and Drug Administration already authorized the kid-size shots for children — just a third of the amount given to teens and adults.
President Joe Biden hailed the decision as a "turning point" in fight against Covid.
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The decision marks the first opportunity for Americans under 12 to get the powerful protection of any Covid-19 vaccine.
The US government was well ahead of the decision, procuring enough doses for the children in the 5-11 age group and beginning to ship them across the country.
The government has already secured enough vaccine for every child in America, Biden said, adding that over the weekend officials began the process of packing and shipping millions of doses.
The vaccine will still be given in two injections, three weeks apart. The dosage has been adjusted to 10 micrograms per injection, compared to 30 micrograms for the older age groups.