Getting sick while breastfeeding raises an immediate, practical question: do I keep feeding, or pause? For most common illnesses the answer is reassuring — keep going. Continuing protects the baby better than stopping does, because the milk you make while ill carries antibodies tailored to whatever you've caught.
The handful of situations that genuinely need a pause or change are quite specific, and worth knowing about so you can spot the difference between "actually need to act on this" and "received well-meaning but outdated advice."
Healthbooq supports breastfeeding parents with evidence-based guidance on common questions across the breastfeeding journey, including how to manage feeding safely during maternal illness.
Why Continuing to Breastfeed Is Usually the Right Choice
When you catch an infection — a respiratory virus, a stomach bug, a more serious bacterial infection — your immune system starts generating antibodies specific to that pathogen within hours. Those antibodies turn up in breast milk and reach the baby at every feed. So a baby who continues to breastfeed during your illness is getting antibody protection precisely matched to whatever is currently going around the household — at the moment when they need it most, because the baby was almost certainly exposed days before you noticed any symptoms.
Stopping breastfeeding doesn't undo that exposure. It just removes the protection your milk would have given. In most cases the "stop feeding to keep the baby safe" intuition has it the wrong way round.
Common Colds and Respiratory Illnesses
Colds, flu, and other respiratory viruses — including COVID-19 — are the most common reason breastfeeding mothers worry. They shouldn't. These viruses aren't transmitted through breast milk in clinically meaningful amounts; they spread through the air and through hand-to-face contact. The baby is already in the same airspace as you. Breast milk during these infections actively delivers antibodies against the specific virus.
Sensible practical adjustments — washing hands before handling the baby, turning your head when coughing or sneezing, wearing a mask if you're closely face-to-face with a young baby and feel particularly unwell — reduce transmission. None of them require any change to feeding.
Gastrointestinal Infections
Most causes of vomiting and diarrhoea don't require a pause in breastfeeding. Transmission is faecal-oral, not via milk, so the protective measure is rigorous hand hygiene around nappy changes, food prep, and trips to the toilet. The milk itself often carries antibodies against the bug, and helps keep the baby hydrated.
If you're significantly dehydrated yourself, your supply may dip for a day or two. Prioritise your own rehydration — oral rehydration solutions, sips of water, broth — and feeding as often as the baby will take it. Supply almost always recovers as you do.
Mastitis and Breast Infection
Mastitis is the place where "keep feeding" goes from helpful to essential. Effective milk removal is the treatment: frequent feeding from the affected breast, with a good latch and full drainage, is what resolves the inflammation. Stopping or under-draining feeds an infection that thrives on stagnant milk and significantly increases the risk of progressing to a breast abscess. If antibiotics are needed, the usual choices — flucloxacillin, co-amoxiclav — are compatible with breastfeeding.
Medication and Breastfeeding
The bigger practical issue is usually not the illness itself but the medication used to treat it. Most over-the-counter medicines used for everyday illness — paracetamol, ibuprofen, most decongestants at standard doses — are compatible with breastfeeding. Most antibiotics prescribed for ordinary infections are too. Specific medications need individual checking, but the default position is "compatible unless there's a specific reason to think otherwise," not the other way round.
The Drugs in Breastmilk information service from the Breastfeeding Network gives up-to-date, evidence-based guidance on specific drugs (email and helpline). The LactMed database from the US National Library of Medicine is a free, searchable reference widely used by UK clinicians too. If a prescribing clinician tells you to stop breastfeeding because of a medication, it's reasonable to ask which evidence the advice is based on — precautionary blanket advice is common and often outdated.
When to Seek Specific Guidance
A small number of conditions need specific advice rather than a general rule:
- Active TB — assess and start treatment before resuming breastfeeding.
- HIV — in the UK, formula feeding is generally recommended for mothers living with HIV.
- HTLV-1 infection — breastfeeding not recommended.
- Hepatitis B in the mother — not a contraindication if the baby has received the standard vaccinations.
For anything you're uncertain about, your GP, midwife, or a breastfeeding-specialist health visitor can advise — and the Breastfeeding Network helpline is a particularly good shortcut for medication questions.
Key Takeaways
Continuing to breastfeed through most common illnesses — including respiratory infections, gastrointestinal infections, and minor fevers — is safe and actively beneficial. Breast milk produced when the mother has an infection contains specific antibodies against that infection, which the baby receives through feeding and which may offer some protection. Stopping breastfeeding during illness exposes the baby to the risks of the interruption without the proposed benefit, since the baby has already been exposed to any infectious agent present. The most common reason for pausing or stopping breastfeeding is maternal medication rather than the illness itself, and most commonly prescribed medications are compatible with breastfeeding.
