Asked how much air it would take to generate such images, Dr Arthurs said: 'We don’t know, I don’t think anybody really knows. Those experiments can’t really be carried out, we can’t experiment on babies giving them 50 or 100mls of air and taking x-rays'

He adds: 'I would guess more than 20mls of air' He is asked, in the absence of another explanation, whether 'someone has deliberately injected air' Dr Arthurs says 'I think that stands to reason'

We're back after a break for lunch. Ben Myers KC, defending, is now questioning Dr Arthurs

He's asking Dr Arthurs about Child H and the positioning of her chest drains. Mr Myers asks if he is aware of guidelines on where chest drain should be inserted, in terms of the intercostal space

Dr Arthurs says that the guidance, to which Mr Myers is referring, 'refers to where they go in terms of the chest wall, not where they are inside chest'

Dr Arthurs accepts that a neonatologist is better placed to comment on positioning of drains and clinical impact

Mr Myers is now moving on to Child I. He put it to Dr Arthurs that from X-rays alone it was "not possible to establish a precise cause" of the air being present, Dr Arthurs agreed

Registrar Dr Rachel Chang, who was on shift the night Child I died, is next in the witness box

Dr Chang is being asked about the events of midnight, 22 October 2015. She tells the court she 'cannot remember' how she was alerted to Child I's crash, but she is reading out her notes from that night

Dr Chang said when she was bleeped she would have perceived that as a 'medical emergency'. Her notes show that when she arrived Child I was being manually ventilated

Dr Chang said Child I 'was in cardiac arrest' when she arrived. The infant was stabilised and an X-ray was taken shortly after (she says this is routine for baby like Child I)

The medic is now recalling events from around 1am on 23 October. Again she does not have a recollection of events and is reading out her notes. Child I again needed chest compressions and ventilation

Slight pause as Dr Chang breaks down in tears while recalling the desperate hour long battle to save Child I. Between 1:16am and 2:10am on 23 October the infant was given numerous rounds of CPR and eight doses of adrenaline, to no avail

Reflecting on Child I's death, Dr Chang said: 'I've never been able to truly explain it, it was awful. 'I knew we’d done everything, I trusted everyone around me'

Prosecution are now reading statements of agreed evidence. First one is from nurse Caroline Oakley - Ms Oakley was on day shifts and wasn't there when Child I died. She described Child I as a 'lovely beautiful but problematic baby'

Another statement from nurse Christopher Booth is being read, he said the events of 23 October were 'very, very distressing for parents' he said the whole team was 'heartbroken' after the death of Child I

Court has now adjourned, back Monday.