Alexandra Walker, 26, and Harrison Simpson, 22, have been sentenced to life imprisonment for the murder of two-year-old Isabelle Welsh.
The sentencing took place at Teesside Crown Court.
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Simpson received a minimum term of 28 years and six months for murder, child cruelty, and sexual assault.
Walker was ordered to serve at least 22 years for murder and child cruelty.
The court heard that Isabelle suffered 21 broken bones in the weeks before her death at her home in Thornaby, Teesside.
Medical staff had raised concerns when Walker brought the toddler to a hospital with a broken leg, but the mother delayed further treatment.
When Isabelle collapsed, Walker hesitated before calling emergency services. CCTV showed her smoking a cigarette while searching online about the toddler's symptoms.
Paramedics found the child covered in bruises before she died in hospital the following day.
Court Proceedings
Prosecutor Richard Wright KC detailed the extent of the violence inflicted on the toddler.
"For weeks this child had been violently assaulted and her death, by that terrible head injury, was simply the end point in that campaign of violence to which she had been subjected," he said.
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Ms Justice Norton addressed the defendants during sentencing, stating, "I have no doubt whatsoever that your lack of urgency or concern for your child was because you wrongly believed that Isabelle was already dead, and you were working out what to do to save your own skin."
