Mayor Bill de Blasio has announced New York City will be ready to vaccinate 5- to 11-year-olds starting Thursday, and public schools will launch vaccine drives next week.

The Centers for Disease Control and Prevention gave final clearance on Tuesday for the use of the Pfizer vaccine for young children between 5 to 11 years old, following the emergency use authorization granted by the Food and Drug Administration last week. The mayor said the final details of the city's rollout would arrive once the CDC sketches out its final guidance for health care providers.

The New York State Department of Health also said Wednesday that providers can begin administering vaccinations. "Providers can start administering pediatric doses for 5-11 year-olds today, as long as they have pediatric doses on hand and are administering the vaccines according to the FDA’s Emergency Use Authorization and the CDC’s COVID-19 vaccine provider agreement," said DOH spokesperson Jill Montag in a statement.

De Blasio said waiting for the CDC guidance will help thousands of local providers administer the vaccine properly to children, and the city will dispense the shots to eligible kids at city-run sites as early as Thursday. The state vaccination website was still not accepting appointments for the newly-eligible age groups as of Wednesday morning. The city vaccination website still had Pfizer listed for 12 years old and up and was not taking appointments for younger children.

“Tomorrow's going to be a historic day for this city in our fight against COVID as we reach our youngest New Yorkers, so city-run sites will be ready, up and running, ready to go,” de Blasio said at his press briefing Wednesday.

Next week, every public school with an eligible population will host a one-day vaccination drive to reach a broader swath of families. Parents or guardians will need to accompany their children.

Unlike the vaccination push for adults that centered on large-scale sites and community clinics, state and city officials have repeatedly invoked family pediatricians as critical to rolling out the vaccine for younger kids.

“We have been gearing up for the last few weeks,” said Dr. Warren Seigel, chair of the New York State American Academy of Pediatrics. “We're very excited about this. This is a huge milestone in the fight against COVID-19.”

Some pediatricians have already warned of limited initial supply: Tribeca Pediatrics, a large chain with three dozen locations around New York City and New Jersey, said in an email to parents that appointments would be limited to three facilities until they could roll out to more clinics. South Slope Pediatrics in Brooklyn also said they couldn’t schedule appointments until they get more information from the city’s health department about when they will receive their first delivery of doses and the overall shipping schedule.

READ MORE: NY Pediatricians Prep For Early Rush to Vaccinate Youngsters

“I would tell families to hang in there. Just like when we started the COVID vaccine for adults, we got better at it as days went on,” Seigel said. “We will be ready as soon as everybody gets their shipment.”

Here are some answers to other frequently asked questions.

Does the vaccine cost money or require insurance?

No - the vaccine is free. You don't need insurance or proof of legal status either.

What are the details of the dosage?

Kids between 5 to 11 years old will receive a dose that's about a third the size of what’s given to adults.

Can my child get Moderna or J&J instead?

No, only Pfizer has been authorized for kids between 5 and 11 years old.

When can I get my child vaccinated at a city site? At their school?

The city-run vaccination sites hope to begin inoculations Thursday, though the website wasn't booking appointments for younger kids as of Wednesday. Starting next week, the Department of Education will hold vaccination sites on one day at every public school in the city with eligible students.

What about state-run vaccination sites?

As of Wednesday morning, the state-run vaccination site was not accepting appointments for 5- to 11-year-olds yet. But Hochul is arranging #VaxtoSchool pop-up clinics around the state.

What about pharmacies and pediatricians?

Some national pharmacies like CVS and Walgreens are booking appointments for next week. Many pediatricians in New York City said they were awaiting supplies before making appointments.

Do I need an appointment for the city-run sites?

Dr. Dave Chokshi, the city's Health Commissioner, said walk-ins are available, but parents should consider making an appointment.

"I do strongly recommend particularly in the initial days that parents book an appointment because we do expect that some sites will be particularly busy as people come in to get their child vaccinated in the early days, and we want to make that a smoother process," Chokshi said.

My kid turns 12 years old in between the first and second shots. What happens then?

“Once you hit 12, then you get the adult dose. So the dosage is based on the age of the child at the time of the vaccine,” said Dr. Warren Seigel, the chair of the New York State American Academy of Pediatrics. According to testimony delivered Tuesday to the CDC, Pfizer's clinical trial only gave out child-size doses to its recipients even if they turned 12 between their first and second shots.

How long is the vaccine effective in my child?

It’s too soon to say, Seigel said. “We don't even have the vaccines in the arms of those children. So we can't really comment on how long this is going to work,” he said. “But we do know that with the holidays coming up, this is the best time to get your children their COVID vaccines as well as update all their other vaccines so that we can all have a good holiday season.”

Pfizer plans to follow each of the trial participants for at least six months.

What are some possible side effects?

Seigel said the side effects are similar to what some adults have experienced after getting the vaccinations, but the rates have been slightly lower among 5- to 11-year-olds in their clinical trials. Kids in Pfizer's trial experienced half as much fever, and the rate of fatigue was 20 percentage points lower. The side effects might be milder because the dose is smaller or because the kids are younger.

“The only thing that's different about the COVID-19 vaccine is you may get the swollen glands, swollen lymph nodes and some fatigue, but that goes away within a day or two," Seigel said. "So it's really nothing to worry about. The side effects are very, very similar to all the other vaccines that children have gotten.”