Barking Birth Centre has been told to improve by a regulator after an inspection.
The Care Quality Commission (CQC) visited the service, based at Barking Community Hospital, in August.
The regulator's findings were published in a report today (November 15), where it rated the centre 'requires improvement'.
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Challenges around staffing were mentioned by inspectors in its report, which they said "affected the sustainability" of the service.
They found that women could not always access the centre, run by Barts Health NHS Trust, due to "intermittent" closures and that staff satisfaction was mixed.
There were 121 babies born at the centre between March 2021 and April 2022 but monitoring of outcomes for women and babies who used it was limited, according to inspectors.
CQC also published reports outlining its findings from inspection visits made to maternity services at Whipps Cross Hospital, The Royal London Hospital and The Barkantine Centre, on the Isle of Dogs, in August.
The regulator gave Barkantine its lowest rating - 'inadequate' - whilst it graded the maternity services at Royal London 'requires improvement'.
A 'good' rating was given to Whipps Cross for its maternity care.
These maternity services are also all run by Barts Health.
Nicola Wise, CQC head of hospital inspection, said: “Maternity services across England face significant challenges, but there are steps Barts Health NHS Trust can and must take to ensure all risks to mothers and babies are well managed while they are in its care.
“The trust has our findings and it knows where it must improve. We will not hesitate to take further action if people are at risk of harm.”
The regulator issued Barts with a warning notice requiring to make "significant" improvements at Barkantine.
The centre, which saw 233 deliveries in 2020, "did not have sufficient leadership capacity to manage, monitor and improve the service", inspectors wrote.
CQC said Barts proactively reduced its services at Barkantine to focus on addressing areas of concern following the inspection.
Among reasons given for the service's grading included "significant failures" in performance management and audit processes.
Leaders had "little understanding or management of risks and issues", according to CQC.
Inspectors wrote: "Staff did not always effectively assess, monitor and manage risks to people using services so there were missed opportunities to minimise harm.
"Leaders didn’t have a vision or strategy to provide safe and sustainable services at the birth centre."
Barkantine also did not have adult emergency resuscitation equipment or safe equipment to evacuate a woman from a birth pool in the event of a mother collapsing, CQC said.
The Royal London in Whitechapel, where more than 5,100 babies were born between August 2021 and July 2022, saw its maternity service downgraded to 'requires improvement'.
CQC said: "The service did not have enough staff to care for women and keep them safe."
"Workload pressure" meant staff were not supported to develop their skills and some staff did not feel respected, supported and valued, inspectors found.
Medication was also not managed safely, according to the report.
The maternity service at Whipps Cross Hospital, in Leytonstone, was however rated 'good' by CQC.
According to inspectors, staff received training in key skills and "worked well together for the benefit of women".
They added: "Staff mostly felt respected, supported, and valued. They were focused on the needs of women receiving care.
"People could access the service when they needed it and did not have to wait too long for treatment. Staff were committed to continually improving services."
But inspectors did find that the Whipps Cross maternity service also did not have enough staff to "keep women safe".
They also wrote that staff "did not always assess risks to women and babies in line with guidance" and that records were not always up to date.
There were almost 4,000 babies born at the hospital between August 2021 and July 2022.
Ms Wise said the trust's leaders need to develop plans to meet patient needs despite the staffing shortages.
"This should include developing a comprehensive understanding of the issues it faces, so it can tailor its response accordingly.
“The trust must also ensure all its maternity staff receive the right training to deliver safe care and treatment, and that it has the right policies in place to help staff fulfil their roles."
But she admitted inspectors found instances of good practice across the trust's maternity services.
These included "good engagement with women, the community and other healthcare partners to help shape care to meet people’s needs".
A spokesperson for Barts Health NHS Trust said: "We are actively recruiting, including from overseas, and more than 70 new midwives are set to join our hospitals in the coming weeks.
"Despite the national shortage of midwives we are working to improve our services for pregnant women in line with the CQC recommendations.”
The visits took place as part of CQC’s national maternity inspection programme, the regulator said.
Maternity services at Newham Hospital were not visited as part of the August inspection.
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