Red flags — call us immediately or go to the Emergency Department if:
- Your baby is very hard or impossible to wake after a feed (opioid sedation)
- Your baby's breathing is slow, irregular, or has long pauses (respiratory depression)
- Your baby's lips or fingertips look blue (hypoxia)
- Your baby is floppy or limp
- Your baby is refusing feeds consistently
- Your baby has a high-pitched cry, tremors, or is unusually irritable (possible withdrawal)
- A rash that does NOT fade when you press a clear glass on it — sepsis sign
- Fever in a baby under 3 months (any temperature ≥ 38.0 °C)
- Fast breathing, blue lips, or sucking-in of the ribs — breathing emergency
- A fit/seizure, or your child becomes floppy or unresponsive — general red flag
What strong opioids are and when they're used
Oxycodone and morphine are strong painkillers in the opioid family. Doctors prescribe them after major surgery (including caesarean section), for severe injury, for cancer pain, or in palliative care. They are very effective for severe pain that doesn't respond to paracetamol or ibuprofen. These medicines pass into breast milk in measurable amounts, so breastfeeding requires careful monitoring.
Short-term post-operative use — often manageable
For a short course after surgery (typically 2–5 days), using the lowest effective dose of morphine or oxycodone while breastfeeding is often possible with careful monitoring. Morphine is generally considered the preferred strong opioid during breastfeeding because it has been studied more and has predictable milk transfer. Your baby should be watched closely during this time. Take your medicine only as prescribed, use the lowest dose that controls your pain, and ask your doctor about paracetamol and ibuprofen as add-ons so you need less opioid.
Signs to watch for in your baby every time after you feed
After every breastfeed, check your baby. They should be alert and able to wake normally. Watch for these warning signs: very drowsy (much harder than usual to wake), limpness, slow or irregular breathing, poor feeding (taking less than half their usual amount), or a blue tinge around the lips. If you see any of these, call 112 immediately — do not wait.
Long-term use — specialist input is essential
If you need oxycodone or morphine for weeks or months — for cancer pain, chronic pain, or palliative care — the decision about breastfeeding is more complex and must involve your pain specialist, oncologist, or palliative care team, together with a lactation consultant. Infant monitoring, dose optimisation, and a planned schedule for feeds in relation to dose timing are all part of safe long-term management. This is not a question to manage alone.
Do not stop your opioid abruptly
If you have been taking opioids for more than a few days, stopping suddenly can cause severe pain and, if the dose is high, withdrawal symptoms in you and your baby. Never stop an opioid abruptly without medical advice. Contact your prescriber or specialist before making any changes. Your baby can be safely monitored during a supervised, gradual wean if needed.
If anything changes
Take the lowest effective dose for the shortest time possible. After every breastfeed, check your baby is alert and breathing normally. If your baby is very hard to wake, limp, or breathing slowly — call 112 immediately. This is a situation that always needs close monitoring.
Emergency? Call 112. Do not wait for a reply from us.
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Message us on WhatsAppReviewed and signed off by Dr Didier Decamps on 5 September 2026. This is general information and does not replace an individual assessment by a qualified clinician.
Written with AI assistance. Reviewed, corrected and signed by Dr Didier Decamps, paediatrician.
Last reviewed: 5 September 2026