Louise Porton has been jailed for life for murdering her two daughters in Rugby.
The 23 year old, of Skiddaw, will serve a minimum of 32 years before she is eligible for parole.
The jury at Birmingham Crown Court found her guilty following a four week trial.
Three-year-old Lexi was pronounced dead by paramedics at the family home in Beechwood Court, Rugby in the early hours of 15 January 2018. Porton called an ambulance saying she had found Lexi lifeless in her bed after going in to check on her.
Following Lexi's death the Sudden Unexpected Death in Infancy and Childhood procedures (SUDIC) were followed by professionals.
Scarlett died a couple of weeks later. Porton claimed that on the evening of 1 February she had set out to take Scarlett to the hospital after she had fallen ill. On her way to the hospital she pulled over in the car park at Elliott's Retail Park in Rugby to call an ambulance.
Scarlett was taken to hospital where she was pronounced dead.
Following Scarlett's death, a Home Office pathologist and a paediatric pathologist worked together to complete a post mortem on both Scarlett and Lexi. Following extensive enquiries with specialist doctors no natural cause of death was found for either child. It was established that both children had died as a result of deliberate airway obstruction.
Following Scarlett's death Warwickshire Police launched a murder investigation into the deaths of both children.
On 20 March 2018, Porton was arrested on suspicion of murdering Lexi and Scarlett.
On 25 January 2019, she was charged with their murders.
Throughout her police interviews Porton denied responsibility for the deaths of Lexi and Scarlett.
Detective Superintendent Pete Hill said:
"I will never be able to understand why Louise Porton murdered her children; Lexi and Scarlett.
"It is clear from the evidence that Porton tried to kill her daughter, Lexi, on at least two occasions prior to her death on 15 January 2018.
"Not content with killing one of her children she did exactly the same to her other daughter, Scarlett, on 1 February 2018.
"She has lied repeatedly to friends, family and professionals to cover her tracks. At no point throughout the whole investigation has she ever shown any real signs of emotion.
"Our thoughts are with the families of Lexi and Scarlett. I'm sure today's outcome will do little to heal their pain, but I hope they can take some comfort.
"I would also like to thank the medical professionals who provided expert opinion on the case, without their support a successful prosecution would not have been possible."
"We welcome the sentence handed to Porton. These were premeditated murders for which she has shown no remorse and the length of the sentence reflects this.
"I would like to thank the jury; they diligently went through the appalling details of Porton's crimes. They saw through her lies before returning a guilty verdict.
"The family of Lexi and Scarlett have thanked everyone for their kind messages and thoughts. I would now like to ask that they be left alone as they continue to grieve."
Statement from Chris Draper - Lexi's and Scarlett's father - and the wider family*:
"When we lost Lexi we were heart broken and couldn't believe she had gone. Then we were devastated to hear about Scarlett.
Only having a short time with Lexi and never meeting Scarlett makes it all the more heart breaking.
We will miss out on all those special occasions they would have celebrated. Their first day at school, birthdays, getting married and having children of their own.
The loss of Lexi and Scarlett has not just affected the immediate family, but also all those who were part of their lives.
The only comfort is that Lexi and Scarlett are together.
We would like to thank everyone for their support and help."