Breastfeeding provides babies with nutrition that changes as they grow. Breast milk also contains antibodies, immune cells, proteins and other biologically active components that support an infant’s developing immune system.

These benefits extend beyond digestion and nutrition. Research has found that breastfed babies have a lower risk of severe lower respiratory illnesses, while some studies have also identified associations between breastfeeding and a reduced risk of childhood wheezing or asthma. However, breastfeeding cannot prevent every infection, cough or breathing condition. (CDC)

Understanding what breastfeeding can—and cannot—do helps parents make informed decisions about their baby’s nutrition and respiratory health.

How Does Breastfeeding Support a Baby’s Respiratory Health?

Breast Milk Supports the Developing Immune System

A newborn’s immune system is still developing and learning how to respond to viruses, bacteria and other environmental exposures.

Breast milk contains immune-related components, including secretory immunoglobulin A, commonly known as IgA. It also contains immune cells, lactoferrin, human milk oligosaccharides and anti-inflammatory factors. Together, these components help support the baby’s natural defences and contribute to the development of a balanced immune response.

This does not make a baby immune to illness. Breastfed babies can still develop colds, bronchiolitis, influenza, pneumonia and other respiratory infections. The benefit is that breastfeeding is associated with a lower risk of certain infections and severe lower respiratory disease. (CDC)

Breastfeeding Is Associated With Fewer Serious Lower Respiratory Infections

Lower respiratory tract infections affect the airways and lungs and include conditions such as bronchiolitis and pneumonia.

Studies have consistently found an association between breastfeeding and a lower likelihood of severe respiratory illness during infancy. Longer breastfeeding duration, including breastfeeding for approximately six months or more, has also been associated in some studies with a reduced risk of lower respiratory infections during early childhood. (PMC)

Breastfeeding should therefore be viewed as one protective factor among several. Vaccination, avoiding tobacco smoke, practising good hygiene and seeking prompt medical care when a baby is unwell remain essential.

Does Breastfeeding Help a Baby With a Cough?

Breastfeeding does not directly treat the medical cause of a cough. A cough may be caused by a cold, bronchiolitis, influenza, asthma, an environmental irritant or another condition that may require assessment.

However, continuing to breastfeed during many common illnesses can help provide the baby with fluids, energy and nutrition. Breastfeeding may also offer comfort when a baby is unsettled or feeding less than usual.

The World Health Organization advises continuing breastfeeding during illness and increasing fluid intake, including offering more frequent breastfeeding when appropriate. (World Health Organization)

A parent should not depend on breastfeeding alone when a baby is coughing or appears unwell. A baby with breathing difficulty, poor feeding, unusual sleepiness or a worsening cough needs medical assessment.

Tips for Breastfeeding a Congested Baby

A baby with a blocked nose may find it more difficult to coordinate sucking, swallowing and breathing. Parents may find it helpful to:

• Offer shorter, more frequent feeds.
• Keep the baby in a more upright feeding position.
• Allow the baby to pause and rest when needed.
• Follow a healthcare professional’s advice for safely clearing nasal congestion.
• Monitor wet nappies and feeding amounts for signs of dehydration.

Medical advice should be obtained when the baby is taking substantially less milk than normal or appears to be struggling to breathe while feeding. (CDC)

Can Breastfeeding Improve Lung Development and Lung Function?

The lungs continue to grow and develop throughout childhood. Adequate nutrition, protection from infections and a healthy environment all contribute to this process.

Some observational studies have reported slightly better lung-function measurements among children who were breastfed. A recent systematic review found an association between breastfeeding and improved lung function in children between the ages of 6 and 16, although the researchers noted that further high-quality evidence is needed. (PubMed)

This means it would be too strong to claim that breastfeeding directly creates “stronger lungs” or guarantees better breathing throughout life. The more accurate conclusion is that breastfeeding supports overall infant health and may be one of several factors associated with healthy respiratory development.

Breastfeeding, Wheezing and Childhood Asthma

Asthma is influenced by multiple factors, including genetics, allergies, environmental exposures, respiratory infections and family history.

Evidence suggests that breastfeeding is associated with a lower risk of childhood asthma in some populations. The American Academy of Pediatrics has described the supporting evidence as moderate and primarily observational, meaning that an association exists but direct cause and effect cannot be established with certainty. Some research also suggests that longer or exclusive breastfeeding may offer greater protection, although findings are not completely consistent across all studies. (American Academy of Pediatrics)

Breastfeeding therefore cannot guarantee that a child will not develop asthma or wheezing. Parents should speak with a paediatrician when a child experiences repeated wheezing, coughing at night, breathing difficulty or symptoms triggered by exercise or respiratory infections.

The Gut-Lung Axis: An Emerging Area of Research

Breast milk helps shape the community of microorganisms in a baby’s digestive system, known as the gut microbiome.

Researchers are studying how the gut microbiome communicates with the immune system and may influence inflammation in other parts of the body, including the respiratory system. This relationship is often described as the gut-lung axis.

The science is promising, but it is still developing. It should not be presented as proof that changing gut bacteria will prevent respiratory illness. Current evidence supports describing the microbiome as one possible pathway through which breastfeeding may influence immune and respiratory development.

Does Breastfeeding Provide Long-Term Respiratory Benefits?

Most of the clearest respiratory benefits are seen during infancy and early childhood, when babies are particularly vulnerable to infections.

Some studies have reported associations between longer breastfeeding duration and improved lung-function measurements or a lower likelihood of recurrent coughing later in life. One study, for example, found an association between breastfeeding for four months or longer and a lower risk of recurrent cough in early adulthood. (PMC)

These findings are interesting, but they do not prove that breastfeeding alone caused the long-term difference. Respiratory health is also affected by air pollution, tobacco exposure, childhood infections, housing conditions, genetics and many other factors.

For this reason, “possible long-term benefits” is more medically accurate than promising lifelong respiratory protection.

Breastfeeding and Respiratory Health in Premature Babies

Human milk is especially valuable for premature and low-birth-weight babies, whose digestive, immune and respiratory systems are less mature.

The World Health Organization identifies breastfeeding as the preferred feeding approach for premature and low-birth-weight infants wherever possible. The CDC also reports that human milk is associated with a lower risk of necrotising enterocolitis, a serious intestinal condition affecting premature infants. (World Health Organization)

Research has also explored whether human milk may reduce respiratory complications such as bronchopulmonary dysplasia in very premature babies. Some studies have found a protective association, but the quality and consistency of the evidence remain limited.

Premature babies often have specialised nutritional requirements and may need fortified human milk, expressed milk, donor milk or other forms of nutritional support. Their feeding plan should always be managed by the neonatal and paediatric care team.

Protecting a Baby’s Lungs Beyond Breastfeeding

Breastfeeding is only one part of protecting a child’s respiratory health.

Keep the Baby’s Environment Smoke-Free

Secondhand smoke increases an infant’s risk of lower respiratory illnesses such as bronchitis and pneumonia. It is also associated with impaired lung function and an increased risk of sudden infant death syndrome.

Smoking should not take place near the baby, inside the home or inside the family car. People who smoke should be encouraged to stop and seek professional cessation support. (CDC)

Follow Recommended Vaccination Guidance

Recommended immunisations help protect babies from infections that can cause serious respiratory complications. Parents should follow the vaccination schedule advised by their country’s health authorities and their child’s paediatrician.

Reduce Exposure to Respiratory Infections

Parents and caregivers can help reduce infection transmission by washing their hands regularly, keeping the baby away from people who are clearly unwell and cleaning frequently touched surfaces.

Maintain Healthy Indoor Air

Where possible, keep indoor spaces ventilated and reduce the baby’s exposure to smoke, strong fragrances, mould, dust and other substances that may irritate the airways.

When Does a Baby’s Cough Require Medical Attention?

Many coughs are caused by common viral infections. However, babies can deteriorate quickly, and breathing problems may not always begin with a severe cough.

Seek urgent medical help when a baby:

• Is breathing rapidly or struggling for each breath.
• Has ribs or skin pulling inward during breathing.
• Makes grunting, wheezing or harsh breathing sounds.
• Has pauses in breathing.
• Develops blue or grey lips, skin or tongue.
• Is unusually sleepy, floppy or difficult to wake.
• Is feeding much less than usual.
• Shows signs of dehydration, such as considerably fewer wet nappies.
• Has a fever and is younger than three months.
• Appears to be getting worse rather than better.

Respiratory infections such as RSV may initially cause a runny nose, reduced feeding and cough before progressing to wheezing or breathing difficulty. Very young infants may instead show irritability, decreased activity or pauses in breathing. (nhs.uk)

How Long Should a Baby Be Breastfed?

The World Health Organization and UNICEF recommend:

• Beginning breastfeeding within the first hour after birth where possible.
• Exclusive breastfeeding during the first six months.
• Introducing safe and nutritionally appropriate complementary foods at around six months.
• Continuing breastfeeding up to two years of age or beyond, for as long as the mother and child wish to continue. (World Health Organization)

“Exclusive breastfeeding” means that the baby receives breast milk without additional food or drink, including water, unless medication, vitamins or another medically necessary supplement has been recommended.

Breastfeeding experiences vary, and some parents may be unable to breastfeed exclusively or for the recommended duration. Families should receive practical, respectful support from paediatricians, midwives and qualified lactation professionals based on the needs of both the mother and baby.

Conclusion

Breastfeeding provides nutrition while supporting a baby’s developing immune system. It is associated with a lower risk of severe lower respiratory illness and may also be linked to a reduced likelihood of childhood asthma, wheezing and certain respiratory symptoms later in life.

These benefits should not be interpreted as a guarantee that a breastfed baby will never develop a cough, chest infection or breathing condition. Respiratory health also depends on vaccination, a smoke-free environment, healthy indoor air, reduced exposure to infections and prompt medical attention when warning signs appear.

When a baby has a mild illness, continued breastfeeding can provide fluids, nutrition and comfort. Breathing difficulty, poor feeding, unusual drowsiness or worsening symptoms should always be assessed by a healthcare professional.

This article provides general health information and does not replace diagnosis, treatment or advice from a qualified healthcare professional.

Frequently Asked Questions

Does breastfeeding protect babies from respiratory infections?

Breastfeeding is associated with a reduced risk of severe lower respiratory illness and some respiratory infections. However, it does not prevent every cold, cough, case of bronchiolitis or chest infection.

Does breastfeeding help when a baby has a cough?

Breastfeeding does not treat the underlying cause of a cough, but it can provide fluids, nutrition and comfort during many common illnesses. Medical advice is needed if the baby has breathing difficulty, poor feeding, unusual drowsiness or worsening symptoms.

Can breastfeeding prevent childhood asthma?

Breastfeeding is associated with a lower risk of asthma in some studies, but it cannot guarantee that a child will not develop asthma. Genetics, allergies, environmental exposures and respiratory infections also influence asthma risk.

Is breast milk beneficial for premature babies?

Yes. Human milk provides important nutrition and immune support for premature babies and is associated with a lower risk of certain complications. Premature babies may require an individual feeding plan or fortified milk under the supervision of their neonatal care team.

How long is exclusive breastfeeding recommended?

The World Health Organization recommends exclusive breastfeeding for the first six months, followed by continued breastfeeding alongside appropriate complementary foods up to two years of age or beyond.