The actress, who played Lavender Brown in the film adaptations of JK Rowlinghit books, gave birth to her son Tenn in October. His “traumatic” delivery left him in the neonatal unit, she said.
In an Instagram post, she shared a photo of the little boy in the hospital, with a laptop showing Boris JohnsonMonday night speech to the nation in the foreground of the photo.
Live COVID updates as lockdown begins
“I watched the lockdown information from a secluded room in the hospital,” Cave wrote. “The poor baby is covid positive.
“He’s fine and doing well but they are vigilant and careful, fortunately.
“This strain is super potent and contagious, so I hope people take extra care in the weeks to come. ”
Cave told her 154,000 followers that she wished her family’s New Year would start differently and that she “really didn’t want to be back in the hospital so soon after her traumatic birth.”
She went on to praise NHS staff including her brother, an A&E doctor and her father, a general practitioner.
“Once again, I’m in awe of the nurses and the doctors,” the star said.
Tenn now weighs 9 pounds 7 ounces, she added, “So he’s a stronger, fatter boy than he was the last time we were in a hospital room (and the needle entered his hand with louder and more powerful cries) ”.
Cave, who is also a comedian and artist as well as an actress, and her partner, comedian Alfie Brown, are already parents to Donnie, five, and Margot, three.
After giving birth to Tenn, Cave recounted how he was born just 40 minutes after his waters broke, saying, “It was a very different experience than my first two births… much more humiliating, terrifying and out of my mind. control. ”