Lucy Letby, the nurse jailed for murdering seven babies and attempting to murder six others, has filed a formal appeal against her convictions.
Court staff said on Friday that they had received an application for permission to appeal.
No date has yet been set to hear the appeal.
She was handed 14 whole-life orders after being convicted last month, meaning she will never be allowed out of prison.
Letby, who was in her mid-20s and working at the Countess of Chester Hospital at the time of the murders, is now the UK’s most prolific child killer of modern times.
She killed her victims by injecting the infants with insulin or air or force feeding them milk.
Her victims included both boys and girls, many of whom were born prematurely.
After she had killed the infants, Letby searched for 11 of the victims’ families on social media and even sent one set of parents a sympathy card on the day of their baby’s funeral. She took a photo of the sympathy card before she posted it.
The Department of Health has previously said that an independent inquiry will be held into Letby’s case, and will examine “the circumstances surrounding the deaths and incidents – including how concerns raised by clinicians were dealt with”.
Typically, applications for permission to appeal against a crown court decision are considered by a judge without a hearing.
If this is refused, people have the right to renew their bid for permission at a full court hearing before two or three judges.
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