After a baby died in the UK, doctors found the virus had infected his mother, but there was no immediate risk of transmission.
Dr David Murray, who leads the National Centre for Preventive Medicine at King’s College London, said there was a risk of other babies being infected, but not too much risk.
“It’s not that babies who get the virus will die, but they could have died because they were born with a weakened immune system,” he said.
The UK has been hit hard by the pandemic, with more than 100,000 cases of the coronavirus and more than 20,000 deaths.
Doctors have been treating patients with a combination of antibiotics and antivirals, and many have been forced to use masks.
But Mr Murray said he was surprised how quickly the virus spread.
He said he thought that once the first cases were diagnosed, the UK could have avoided it, but the numbers of cases, deaths and hospitalisations have risen.
What is the baby fever?
It is a condition caused by the virus, and is very common in babies who have been exposed to the virus during pregnancy or have had contact with people who have had the virus.
It can also be fatal.
When babies die, their bodies do not make enough antibodies, which can help protect them from infection.
If you are worried about a child’s health, you can call 111 for advice on whether to get tested or for advice about the coronajucavirus.
You can also call NHS England’s helpline on 0300 123 867.