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Protective immune cells in breastfeeding women guard against breast cancer, research finds

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Women who breastfeed develop protective immune cells that help guard against breast cancer, with effects lasting for more than 30 years, new research shows.

The study found that specialised T-cells — immune cells that fight disease — remain in breast tissue long after pregnancy and provide lasting protection, particularly against triple-negative breast cancer, one of the most aggressive forms.

Observations dating back to the 18th century, when physicians noticed nuns had some of the highest rates of breast cancer, first hinted that childbearing and breastfeeding could protect against the disease.

Modern research has confirmed this link, though the biological explanation was unclear.

Professor Sherene Loi is senior author and clinician scientist at the Peter MacCallum Cancer Centre.

The researcher said: “The key take-home messages are that pregnancy and breastfeeding will leave behind long-lived protective immune cells in the breast and the body, and these cells help to reduce risk and improve defence against breast cancer, particularly triple-negative breast cancer, but potentially other cancers as well as disease.”

Researchers from the Peter MacCallum Cancer Centre in Melbourne studied non-cancerous breast tissue from more than 260 women who had undergone breast reduction or preventive surgery.

They found that women who had given birth had more specialised immune cells called CD8⁺ T-cells — part of the adaptive immune system that targets specific threats, including cancer.

The team then tested whether these cells directly provided protection.

In mice, cancer cells implanted into breast tissue grew less in those that had pups and breastfed compared with those that had not. When the researchers removed the T-cells from the nursing mice, the protective effect disappeared.

The researchers also analysed data from more than 1,000 breast cancer patients diagnosed after childbirth with available breastfeeding records.

Women who had breastfed had better outcomes from triple-negative breast cancer than those who had not. Their tumours also contained more immune cells, suggesting ongoing immune activity against the cancer.

The study provides an explanation for why breastfeeding appears protective, and the findings could help inform new strategies for women unable to have children or breastfeed.

Understanding the underlying biology may aid development of vaccines or therapies that mimic this natural defence.

Professor Loi said: “The effects are really quite small for every individual, but population-wide the effects are large.”

She stressed that breastfeeding does not guarantee protection against breast cancer, noting it is “not a 100 per cent guarantee that they won’t get breast cancer.”

The study also explored why some breast cancers contain high numbers of specialised immune cells while others do not.

Patients with more of these cells generally had better outcomes, particularly with triple-negative breast cancer.

Professor Loi explained that T-cells react not only to viruses or bacteria but also to cancer, describing this response as “one of our very modern therapeutic weapons against cancer.”

Associate Professor Wendy Ingman from the University of Adelaide’s Medical School said longer breastfeeding duration provided greater benefits.

Each year of breastfeeding is linked to a 4 per cent lifetime reduction in the mother’s breast cancer risk.

“This study shows that having babies and breastfeeding causes long-lasting changes in immune cells that could help protect the breast from cancer,” Ingman said.

“I’m hopeful that this type of research will lead to new approaches to reduce women’s breast cancer risk.”

Motherhood

Expectations about sleep affect postpartum sleep quality, study finds

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Pregnant women’s expectations about postpartum sleep may predict sleep quality after birth, outweighing prior sleep and psychiatric history, a study suggests.

The findings suggest attitudes and beliefs about sleep during pregnancy could be a modifiable risk factor for postpartum sleep concerns.

They also indicate that, among women expecting the poorest sleep, higher postpartum anxiety may further worsen sleep quality.

Sammy Dhaliwal, lead author is clinical health psychologist and research fellow in the department of obstetrics and gynaecology at the Perelman School of Medicine at the University of Pennsylvania.

Dhaliwal said: “Most pregnant women in our sample anticipated poor postpartum sleep before it occurred, and it was striking that those expectations predicted worse sleep outcomes even after accounting for factors such as prior sleep disorders, psychiatric history, and number of previous births.

“This suggests that attitudes and beliefs about sleep during pregnancy may represent a modifiable target for early intervention before postpartum sleep problems emerge.”

Sleep disturbance affects an estimated 60 to 80 per cent of postpartum women and is linked to a higher risk of depression and anxiety.

Researchers said it is often regarded as an expected part of life after childbirth rather than a health issue that may be addressed earlier.

The study enrolled 432 pregnant women at about 24 weeks of gestation, meaning around 24 weeks into pregnancy.

Participants completed measures of their expectations about postpartum sleep, current sleep quality using the Pittsburgh Sleep Quality Index, and mood using validated depression and anxiety scales.

Assessments were repeated at six, 12 and 24 weeks postpartum.

A subset of 49 women also wore wrist actigraphy devices at six to eight weeks postpartum.

Actigraphy uses a wearable device, similar to a watch, to estimate sleep and wake patterns based on movement.

The results showed that 70 per cent of pregnant women, or 301 of 432 participants, expected poor sleep in the postpartum period.

Researchers found that predicted sleep disruption during pregnancy was a significant predictor of postpartum sleep concerns.

Among first-time pregnant women without prior health concerns, those who expected greater sleep disturbance had significantly more disrupted sleep after birth, measured by both actigraphy and self-report.

Among women who expected the worst sleep quality, higher postpartum anxiety significantly worsened both measured sleep and self-reported sleep, independent of anxiety levels during pregnancy.

Dhaliwal said the findings point to two possible areas for intervention: addressing sleep-related beliefs during pregnancy and treating postpartum anxiety.

Dhaliwal said: “Postpartum sleep disruption is often treated only after problems develop, but our findings suggest there may be an opportunity to intervene earlier during pregnancy.

“Addressing sleep-related beliefs and postpartum anxiety during prenatal and postpartum care may help improve sleep and emotional well-being in new mothers.”

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Motherhood

Natural birth pressure harming new mothers’ mental health, research finds

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Pressure to have a natural birth can cause lasting psychological harm when labour does not go to plan, new research shows.

The study found that the messages women receive during pregnancy are directly linked to the shame and self-blame many feel when those expectations are not met.

For the first time, the research provides an explanation for why unmet birth expectations contribute to psychological harm.

Several women involved in the research said they felt they had not given birth “properly”, even when medical intervention had saved their lives.

Rebecca Matthews, lead author and PhD researcher at the University of Reading, said: “These women were not failed by their bodies, they were failed by the messages they were given.

“Birth trauma does not begin with birth. It begins in the ideology sold to women throughout pregnancy.

“For the first time we can explain precisely how, by showing how birth culture creates a moral standard for women that defines what a good mother does and then leaves them to blame themselves when birth does not match that.

“Until we reform the way we prepare women for birth, we will keep seeing the same devastating consequences for mothers and their babies.”

The researchers interviewed 21 first-time mothers in the UK whose births did not go as planned.

From NCT and hypnobirthing classes, to social media to midwives, the researchers heard how women are surrounded by messaging that frames natural, unmedicated vaginal birth as the “gold standard”, not just medically preferable, but as a mark of being a good mother and the first test of maternal worth.

Research shows around half of women report their birth differed significantly from their expectations, and for the women in this study, all of whom experienced exactly that, the psychological consequences were profound.

Women judged themselves against the internalised moral standard that this ideology had created.

The researchers are calling for antenatal education to stop treating one kind of birth as the goal and to present all birth outcomes as equally valid routes to motherhood.

They also call for better postnatal screening for women whose births did not go as expected, specifically targeting the shame, self-blame and identity disruption that this research identifies as mechanisms underlying birth trauma.

The findings align with and extend the conclusions of the Kirkup, Ockenden and Birth Trauma Inquiry reports, all of which documented how the institutional pursuit of “normal birth” contributed to preventable harm.

This research provides the first theoretical explanation of how that ideology generates individual psychological harm and points to antenatal messaging as the primary site of such preventable harm.

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Pregnancy

Wales becomes first UK nation to unite maternity care under a single digital record

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System C has completed the national rollout of BadgerNet Maternity across all seven NHS Health Boards in Wales. This is the first time any UK nation has unified its maternity care under a single digital record and patient-facing app.

With approximately 26,000 babies born annually in Wales, BadgerNet connects maternity information across organisational boundaries in the country.

Expectant parents can access their records, maternity appointments and key updates digitally through a single app, wherever they receive care while clinicians have secure access to the right information at the point of care.

The national three-year agreement across all Heath Boards replaces a patchwork of separate local systems and eliminates the need for paper hand-held notes.

Anthony Tracey is director of digital at Hywel Dda University Health Board, the final of the Welsh Health Boards to go live with BadgerNet.

He said: “The rollout of BadgerNet across Wales is a vitally important step forward in modernising our maternity services and providing a consistent service across the country.

“By giving expectant parents direct access to their information and enabling clinicians to share data more effectively, we are strengthening safety, transparency and consistency in maternity care nationwide.”

For expectant parents, the single digital maternity record transforms how they engage with their care.

Instead of carrying paper notes and repeating information at every appointment, parents can access key details, appointments and updates digitally, supporting more informed conversations and shared decision-making.

The result is greater transparency, fewer administrative frustrations and a more joined-up experience throughout pregnancy and into the postnatal period, regardless of which health board they fall under.

For clinicians and Health Boards, the joined-up approach reduces duplication and streamlines handovers across teams and sites. Information is digitally captured once and made available securely wherever it is needed, helping to minimise errors, reduce time spent tracking down notes and support more efficient multidisciplinary working.

At a national level, linking maternity data across Wales creates a foundation for safer, more consistent care.

Aggregated, standardised information enables earlier identification of trends and variation, supports evidence-based policy decisions and enhances long-term service planning.

With a comprehensive view of maternity activity and outcomes across the country, Wales is now better positioned to raise standards for parents, babies and families.

Guy Lucchi, managing director of healthcare at System C, added: “Delivering a truly national approach across all seven Health Boards is a significant achievement for Wales.

“One shared system means information flows with the patient, not the organisation.

“That reduces duplication, supports earlier identification of risk and frees up valuable clinical time.

“Crucially, linking maternity data at a national level provides powerful insight to drive improvement. Health Boards can benchmark, plan services with greater confidence and ensure resources are targeted where they are needed most, while expectant parents benefit from clearer communication and a more connected experience of care.”

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