The woman, who cannot be identified for legal reasons, alleged more than 40 times to medical staff that her baby was bleeding from the nose, mouth and bottom.
Concerned doctors ran tests on the newborn to check for different illnesses, some of which required a stomach endoscopy that was carried out under general anaesthetic and involved intravenous insertions.
The baffled medics transferred the child to another hospital for further tests because the matter was unresolved.
The baby’s mum has now been sentenced for ill treating the infant after police described it as one of its most unusual investigations in recent times.
On August 11 2016, the Teesside woman reported that her daughter was bleeding from the mouth and had blood in her nappy.
The baby was re-admitted to James Cook University Hospital, in Middlesbrough where nurses saw blood on her bedding and her babygrow.
But doctors could find no sign of trauma or injures. Later that evening, a nurse was searching for a change of clothes for the baby while her mother slept.
She found a syringe filled with red liquid next to the mother’s bags, reported Teesside Live.
Doctors locked the syringe away and retained the baby’s blood-stained bedding, before calling Cleveland Police.
The red liquid was later found to be a diluted version of the mother’s own blood.
The baby was placed under immediate police protection and the mother was stopped from seeing her on her own.
The woman pleaded guilty to the ill treatment of her child at Teesside Crown Court on Friday.
Defending the mother, who is in her 30s, Robin Turton told the court that psychiatric reports confirmed that she suffers from emotionally unstable personality disorder.
The woman was in an abusive relationship in August 2016, had just given birth and was suffering from post-natal depression.
The psychiatrist’s report also said the woman would have difficulty coping with a prison sentence.
The woman said she had heard voices in her head, telling her that her baby was sick and that only she could help her.
She believed if she fabricated the symptoms, then doctors would, “do something”.
Since the offence, the court heard that the mother has stopped abusing amphetamines and alcohol; no longer has contact with her abusive ex-boyfriend and is on anti-psychotic medication.
The baby and her woman’s other children have been taken into care.
Sentencing the mother to an 18 month prison term, suspended for 18 months, in addition to a 35-day rehabilitation requirement, Judge Howard Crowson told her she had subjected her baby to uncomfortable medical procedures over a four weeks.
The judge accepted that the woman was remorseful, telling her, “your behaviour was substantially influenced by your inability to cope with your situation and you genuinely believed your daughter was unwell”.
The court heard that the baby is now a happy and healthy child.
Cleveland Police said its The Child Abuse and Vulnerable Adult (CAVA) team began an investigation in August 2016 into the “fabricated and induced” illness after NHS and social services colleagues raised the alarm.
The force said professionals were were concerned about the number of medical investigations and invasive treatments a new-born baby had undergone in just the first five weeks of life.
It said a woman was arrested and the infant was safeguarded while an investigation was carried out.
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The officer who led the case, Detective Sergeant Nicky Barker, said: “This was a complex and highly unusual case with a very young baby at the heart of it.
“The infant’s wellbeing and welfare was a priority throughout, and I’m pleased and relieved to learn they have not suffered any longer term effects.”
Safeguarding Detective Chief Inspector Deb Fenny added: “We will continue to safeguard the most vulnerable in our communities and I would also remind the public that you can report abuse of any kind to Cleveland Police via the 101 number, at any time of day or night (always use 999 in an on-going emergency).”