A string of blunders by NHS workers led to the death of a three-year-old Devon boy, a review has found.
Sam Morrish died in December 2010 from a treatable condition because four health service organisations made mistakes, the Parliamentary Health Service Ombudsman (PHSO) said.
He died of severe sepsis after a “catalogue of errors”.
Sam’s parents also said they had “serious concerns about the competence and accountability” of the ombudsman.
Ombudsman Dame Julie Mellor said that had Sam received the appropriate care, he would still be alive today.
Cricketfield GP Surgery, NHS Direct, Devon Doctors Ltd and South Devon NHS Trust were all criticised.
Failures included inadequate assessment of the toddler, not recognising that he was vomiting blood and a three-hour delay before he received antibiotics at hospital.
His family said as well as losing their son, they feel they have been “failed” by the NHS complaints system.
In a statement released through the Patients Association, they also criticised the ombudsman.
“The astonishing length of time it has taken for PHSO to finalise this report has inescapably prolonged our distress.
“Although we are grateful that the PHSO has upheld our complaints… we are left with serious concerns about the competence, capability and accountability of the PHSO itself.”
Sam’s mother Susannah Morrish said: “The report looks the way it does because of our constant intervention.
“The fact there had to be two draft reports, both of which looked radically different to this final report, says something.
“Our involvement included providing information, pointing out omissions, correcting factual errors.
“Our thoughts were if we didn’t do this, who would?”
Sam’s father Scott Morrish said: “The thing that we’re still trying to push for is, we’re not clear who the ombudsman is accountable to, we’re not clear who really understands what happens behind the scenes there, and we’re not entirely sure that Parliament is actually able to look at anything more than what comes out in the report.”
Dame Julie said: “I accept that the family are right that the investigation method used in this case was not adequate to the complexity of the case.
“I really recognise that this contributed to the family’s distress and we have apologised for that and thanked the family for their feedback on the particular method we used in this case, because we are developing new investigation methods.”
Dame Julie said that Sam’s devastated family suffered “further injustice” because health officials failed to properly investigate the youngster’s death.
“But this case has to be looked at in the context of taking on over 4,000 cases to investigate every year, and receiving very few complaints about the quality of our decision making.
“When we do, we treat it like gold dust to help us improve our service.
“We’ve published this case so that the wider NHS learns from Sam’s death,” she added.
NHS England was ordered to pay £20,000 to the family.
Mr Morrish said: “The irony is we never wanted to lodge a formal complaint.
“We only did because we were advised to by the Patients Association in response to the NHS completely getting it wrong, not once, but twice.
“We didn’t want it to be about blame, we wanted it to result in good learning.”