Changes have been made and are being made by a series of Clinical Commissioning Groups (CCGs), made up of GPs in north west London boroughs, which launched the programme Shaping a Healthier Future (SaHF) in 2012.
Changes have included the closure of the hospital's maternity ward, sparking anger from campaigners.
getwestlondon has complied a series of questions and answers, following conversations with SaHF and campaign groups, to answer your questions.
What exactly is happening to the children's ward, the Charlie Chaplin ward, at Ealing Hospital?
The inpatient children's ward, known as the Charlie Chaplin ward, will close on June 30 this year.
It contains 16 beds, including four day assessment beds, and cares for 10 to 12 children at any one time for those requiring emergency treatment or an overnight stay in hospital, according to Ealing Clinical Commissioning Group (Ealing CCG).
What other changes will occur?
The 24/7 Urgent Care Centre (UCC) will continue to treat children, and those requiring day care and outpatient care will be seen at the hospital as normal.
Changes at Ealing Hospital have also seen the introduction of the the Rapid Access Clinic.
According to Ealing CCG, this clinic will provide GPs with "specialist advice and timed appointments for children needing to see a specialist within 48 hours".
The Children's Community Nursing Team will also move to Ealing Hospital providing community care, such as the treatment a patient may need after they are discharged. For instance, future blood testing or physiotherapy.
Will anything be done about the report led by Michael Mansfield QC, who called for an immediate halt to changes made under SaHF?
The report said these changes should not go ahead and that past changes, including the closure of the Ealing Hospital maternity unit, should be reveresed.
But a spokesperson for Ealing CCG said the report "lacked substantive material, such as new clinical date or evidence, or credible alternative".
Will ambulances stop taking children to Ealing's A&E unit?
Yes, children's specialist A&E care will cease after June 30. Emergency "blue light" ambulances will stop taking children to Ealing's A&E unit and instead take them to West Middlesex, Hillingdon, Northwick Park, Chelsea and Westminister or St Mary's hospitals depending on the child's emergency care needs.
What if the child needs an overnight stay but comes to Ealing Hospital?
Ealing CCG claim that if a child arrives at Ealing Hospital, who needs more specialist care than the UCC can provide, they will be looked after by doctors and nurses before they are transferred to another hospital, thus arguing it will not delay life saving treatment.
Why are the changes going ahead?
According to Ealing CCG, these changes will improve the quality of care across North West London Hospitals because it is claimed that a higher number of specialist senior doctors will be available.
Staff from the inpatient children's ward will be redistributed across North West London, which Ealing CCG claim will strengthen the units they are distributed to.
However it is not yet clear how many of those staff will stay at Ealing Hospital.
A spokesperson for Ealing CCG said: "They (the changes) are necessary to provide consistent high quality seven-day children’s services across North West London, allowing more specialist senior doctors to be available throughout the day and night to treat children.
"This will improve the quality of clinical care and patient experience by getting children back to health more quickly."
Will children be put at risk by delays?
Campaign group Ealing Save Our NHS dispute plans for ambulances to take children elsewhere because, they claim, the majority of children are taken to hospital by their families.
It is feared by Ealing SONHS that this will result in delays, which could mean they would be assessed at the UCC and then taken to another hospital from there, losing valuable time.
But according to Ealing CCG, children will be treated at the hospital before being taken to a different hospital by car, patient transport or ambulance, with a six to eight-minute response time.
Won't parents of patients have to travel further?
An Ealing CCG spokesperson responded: "We appreciate that for some parents, there will be increased travel and we are looking at the information we can provide to parents in that situation so they know the quickest travel routes and also any support that is available."
Will there be room at the other hospitals?
According to Ealing CCG, nearby hospitals are increasing their capacity to accommodate for the children currently being cared for at Ealing Hospital's children's ward.