It's hard to say the babies couldn't have been healed: this seems most likely to have applied to baby C (3)) - the consultant who delivered him wasn't surprised that he died days later because of the obstetric history, but he also suffered an ineffective resuscitation. With baby E (5) - the consultant in charge of him advised parents that no post-mortem was needed, and the consultants generally told the police they wouldn't have found his death surprising in isolation, but a blood transfusion was delayed after he deteriorated.
Baby O (15)'s condition (rupture of liver hematoma) is often fatal, even if poor treatment may have exacerbated the problem. Baby D (4)'s lungs were damaged, but medics did decide to take her off ventilation because she cried, which may have exacerbated things.
Baby A (1) had two possible causes of death, and one (a blood clot to the brain) seems likely to have been due partly to failings on care. Baby P (16) had delays to his treatment and poor medical care, for a condition that wouldn't necessarily be fatal. Baby I (9)'s death is the only one that the medics on Shoo Lee's panel explicitly said might have been avoidable, since she wasn't adequately investigated or treated for respiratory problems.
I'm sure they are familiar to many people reading this, but one page summaries on Lee's panels findings for each child are spread across the two press releases linked at https://lucyletbyinnocence.com/#shoolee
It's impossible to know, of course, how each child's condition might have developed with better medical care, but as the panel says, there seem to have been failures both to recognise the children's conditions and to treat them appropriately.