Baby H was initially 'absolutely fine' when she was born just under six weeks early at the CCH on September 22, 2015.
She weighed 5lb 2oz and had an Apgar of 9 out of 10, namely a test performed on a baby after birth, which then rose to 10 out of 10 within minutes.
But the following morning, the infant’s parents walked into the neonatal unit and were immediately
stopped by staff and informed she was on a ventilator
The prosecution alleges that Letby was responsible for the incidents on successive night shifts in the early hours of September 26 and 27, 2015.
Following the second collapse, a consultant arrived at around 6am on September 27 and Baby H was subsequently transferred to Arrowe Park Hospital in Wirral.
Baby H was initially 'absolutely fine' when she was born just under six weeks early at the Countess of Chester Hospital on September 22, 2015.
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Giving evidence via a written statement in Letby's murder trial at Manchester Crown Court today, the mother of Baby H said: '
We were both quite annoyed that no one had let us know.
'They explained that their first priority was that they had to care for H. We accepted that but said what a shock it was to arrive and find her on a ventilator.'
Staff carried out several x-rays before telling the parents that she had a punctured lung. They stayed beside her incubator the whole day before finally leaving to go to bed – the mother at the hospital, her husband at home.
In the early hours the mother was awoken to be told she had to back to the neonatal unit 'right away', where hospital staff were 'running along the corridors' as they headed towards the unit.
As she arrived, she could see the baby’s ventilator was open and staff trying to resuscitate her.
She said: 'It was obvious to me they were resuscitating her. They told me to go in to the room and just sit with her and hold her hand which I did.'
Staff managed to get her daughter back, but were not able to explain why she suffered a sudden cardiac collapse.
Following the ordeal, both parents stayed with their baby until 11pm, when they left to go to sleep in a room nearby.
But they received a knock at the door and were confronted by an almost identical scene as before, although on this occasion it took staff a shorter time to revive the infant.
Nurse Lucy Letby's trial hears how a doctor had "no clear explanation" for a baby girl's collapse.
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The prosecution claim she first attacked Child H in the early hours of 26 September 2015 and then again the following morning after infant's designated nurse had temporarily left the intensive care room.
Registrar Dr Matthew Neame told Manchester Crown Court about his involvement with the second incident and how he was twice summoned by nurses on the shift.
The first emergency bleep was received after a "profound" drop in Child H's blood oxygen levels and heart rate as medics discovered her breathing tube was blocked with secretions, the court heard.
Several hours later at 00:55 BST on 27 September, Child H suffered more profound desaturations while on a ventilator - but this time her breathing tube contained no secretions.
Child H's heart rate plunged to 40 beats per minute at 01:07 BST and full resuscitation, including chest compressions and doses of adrenaline, was needed for six minutes before she recovered.
Asked how the second crash call was different, Dr Neame said: "The distinction is the lack of clear explanation for the event at this time and the fact that it has happened again in a relatively short space of time.
"Both those things would have made me more concerned about [Child H's] condition."
Dr Neame said he thought Ms Letby was the nurse who he first spoke to upon his arrival to the second crash call.
Nurse Shelley Tomlins, Child H's designated nurse on the nightshift beginning 26 September, said she would not have been in the baby's presence throughout. She said she would have been covered by a colleague while on a break or if she had temporarily left the room.
She told the court: "Given that she was unwell, I don't think we would have left her in her room alone but I can't be sure."
Ms Tomlins said she she could offer no explanation why Child H's blood oxygen levels dropped at 00:55 BST on 27 September.
