The Pfizer coronavirus vaccine has been approved for 12 to 15 year-olds in Britain.

The UK's medicine regulator, the MHRA, says the injections are "safe and effective" for children in that age group and that the "benefits far outweigh any risk".

However, a final decision on whether children will or won't receive the jab hasn't been made yet.

More than half of all adults in the UK have now had both doses of a coronavirus vaccine, the final decision on whether kids will also be vaccinated is now up to the UK's vaccines committee.

Newsround's been putting YOUR questions to Professor Devi Sridhar, who is the Chair of Global Public Health at the University of Edinburgh.

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Professor Devi: "There are some side effects like headaches and fatigues, but in at least two months [of trials] there was nothing actually significant."

Professor Devi: "The Pfizer vaccine has been approved in the UK as being safe and effective and the question now is 'when will children get it?'.

"It looks likely to be once people in their 20s are done, then it will move down to younger age groups.

"So the next group to get it, after those in their 20s, will be those who are 12 and older - probably starting with vulnerable children first."

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Professor Devi: "Those younger than 12 won't get the vaccine yet because it hasn't been trialled in children under 12.

"There are trials ongoing to try and change the dosage to make it more appropriate for younger age groups.

"But right now nowhere is there a vaccine that has been deemed safe for children under the age of 12."

Professor Devi: "So when the Pfizer vaccine was trialled among children in the United States, they found absolutely no cases of illness in the group that received the vaccine.

"So it looks like the vaccine does protect against getting Covid-19."

Professor Devi: "The child and adult version of the Pfizer vaccine are actually exactly the same.

"The vaccine has already been used in millions of adults and now it has been trialled in children and rolled out already in the United States and in Israel."

Professor Devi: "Unfortunately, at this point, the vaccine is only available as an injection.

"But it really doesn't hurt too much, just a quick pinch into your arm for the first time.

"And then several weeks later, the second one and then you're fully protected."

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Professor Devi: "The benefit of getting the vaccine is you don't need to worry about Covid-19.

"It means you're likely to not infect your parents, the people you live with and your teachers.

"The downside is it's another jab, another injection into your arm. But the benefits definitely outweigh the risks."

Professor Devi: "Some children experience similar side effects to adults - these include fatigue (feeling tired), having a headache, feeling generally unwell, but these cleared within a day or two.

"And it seems a small price to pay for actually being protected from the real disease."

Correction: This article has been amended to remove a reference by a contributor that the Pfizer vaccine is "100% safe".

The UK's Medicines and Healthcare products Regulatory Agency (MHRA) has said:

"We have carefully reviewed clinical trial data in children aged 12 to 15 years and have concluded that the Pfizer/BioNTech COVID-19 vaccine is safe and effective in this age group and that the benefits of this vaccine outweigh any risk.

"We have in place a comprehensive safety surveillance strategy for monitoring the safety of all UK-approved COVID-19 vaccines and this surveillance will include the 12- to 15-year age group.

"No extension to an authorisation would be approved unless the expected standards of safety, quality and effectiveness have been met.

"It will now be for the Joint Committee on Vaccination and Immunisation (JCVI) to advise on whether this age group will be vaccinated as part of the deployment programme."