Sleep Training and Breastfeeding: Can You Do Both?

The fear that keeps breastfeeding parents up (in more ways than one)

If you’re breastfeeding and considering sleep training your baby, you’ve probably encountered a version of this warning: “Sleep training will destroy your supply.” It shows up in Facebook groups, in blog comment sections, and occasionally from well-meaning lactation consultants who are rightly protective of the breastfeeding relationship but not always up to date on the sleep training evidence.

The fear is understandable. Breast milk supply operates on demand — the more your baby feeds, the more milk you produce. If sleep training reduces night feeds, doesn’t that reduce demand? And doesn’t reduced demand mean reduced supply?

The short answer is: not usually, not permanently, and not when handled correctly. But the long answer matters more, because the nuance is where most internet advice falls apart.

I’m Milos, founder of Sleep Ready. I work with Canadian families across Ontario and virtually nationwide, and a significant proportion of the families I support are breastfeeding. The sleep-training-versus-breastfeeding conflict is one of the most common anxieties I hear in discovery calls — and one of the most resolvable.

What the research actually says

The most frequently cited study on this question is a 2012 randomised controlled trial published in Pediatrics (the Hiscock study) which followed 326 Australian infants whose families were randomised into a sleep training group or a control group. At 2-year follow-up, there were no significant differences in breastfeeding duration between the groups.

A 2016 study in the same journal (the Gradisar study) looked specifically at graduated extinction and bedtime fading in 6-month-olds. At 12-month follow-up, there were no differences in breastfeeding rates, maternal stress, or infant-parent attachment between the intervention and control groups.

What these studies tell us is that sleep training, when introduced at an appropriate developmental stage and with appropriate method selection, does not systematically shorten the breastfeeding relationship.

What they don’t tell us — and this is important — is that every method works equally well for every breastfeeding dyad. Method selection matters. Timing matters. And the way night feeds are handled during the training window matters more than anything.

Night feeds are not the enemy

This is where most sleep training programmes get it wrong for breastfeeding families: they treat all night feeds as “sleep crutches” to be eliminated.

They’re not. At least not all of them.

Before approximately 6 months of age, most breastfed babies genuinely need at least one overnight feed for caloric and hydration reasons. Some need two. This is not a habit — it’s a nutritional requirement, and eliminating it too early can affect both the baby’s growth and the parent’s supply.

After 6 months, the picture shifts. Many (not all) breastfed babies can maintain adequate intake through daytime feeds alone, especially once solids are introduced. But “can” and “should” are different questions. Some mothers want to keep a 10 p.m. or 5 a.m. feed for comfort, closeness, or supply maintenance. That is a valid choice, and a good sleep plan accommodates it.

The Sleep Ready approach to breastfeeding families is never “drop all night feeds immediately.” It’s always: which feeds are nutritional, which are habitual, and which are something the parent wants to keep? The plan is built around those answers, not around a generic schedule.

When supply actually is at risk (and when it isn’t)

Let me be specific about the supply question, because vague reassurance isn’t helpful.

Supply is unlikely to be affected when	Supply may be temporarily affected when
The baby is 6 months or older	The baby is under 6 months and night feeds are a significant proportion of total intake
Solids are introduced and daytime intake is adequate	No daytime nursing sessions are added to compensate for dropped night feeds
One or more night feeds are preserved during training	Multiple night feeds are dropped simultaneously in a short window
Feeding frequency across 24 hours doesn’t drop dramatically	The parent has a history of borderline supply or is exclusively pumping

Supply is unlikely to be affected when: – The baby is 6 months or older – Solids have been introduced and daytime caloric intake is adequate – One or more night feeds are preserved during the training window – The parent’s overall feeding frequency across 24 hours doesn’t drop dramatically – The parent’s sleep quality improves (which actually supports hormonal regulation, including prolactin)

Supply may be temporarily affected when: – Multiple night feeds are dropped simultaneously in a short window – The baby is under 6 months and night feeds represent a significant proportion of total intake – The parent has a history of borderline supply or is exclusively pumping – No daytime nursing sessions are added to compensate for dropped night feeds

The key word is “temporarily.” Milk supply is dynamic and responsive. If supply dips during the first week of sleep training, it almost always recovers when daytime feeding patterns adjust — which they do, usually within 3–5 days.

For parents with known supply concerns, I always recommend a conversation with their lactation consultant or midwife before we begin. Sleep Ready doesn’t operate in a silo — we coordinate with your existing care team.

The Canadian context

Canada has something most countries don’t: up to 18 months of parental leave. That changes the sleep training calculus for breastfeeding families in an important way.

In the United States, many mothers return to work at 6–12 weeks. The pressure to sleep train early is partly driven by the biological impossibility of functioning at a demanding job on fragmented sleep. Night weaning becomes urgent because work demands it.

Canadian families often have more runway. A parent on leave at 6 or 8 months can approach sleep training more gradually, preserving night feeds longer if they choose, because they’re not facing a return-to-work cliff. That’s a genuine advantage — and one that most American-authored sleep training content doesn’t account for.

At the same time, some Canadian parents on extended leave feel pressure to “just push through” because they don’t have a work deadline. That pressure comes from a different direction — usually family, friends, or the internal expectation that being home means they should be able to handle the sleep deprivation. But parental mental health matters regardless of employment status. Sleep deprivation is a health issue, not a scheduling one.

What I tell breastfeeding families in the discovery call

Here’s the version I give every breastfeeding parent who asks whether they have to choose:

You don’t have to choose. You can sleep train and breastfeed. The question isn’t whether — it’s how. The plan needs to be built around your breastfeeding goals, not against them. If you want to keep a feed, we keep it. If you want to eventually drop it, we do that gradually. If you’re not sure, we wait and see.

The families I work with who are breastfeeding tend to have one specific anxiety more than any other: guilt. They feel guilty for wanting sleep. They feel guilty for considering changing anything about the feeding relationship. And they feel guilty for being exhausted.

You are allowed to want both. You are allowed to breastfeed and sleep. Those aren’t competing goals — they’re compatible ones, when the plan is built correctly.

Sources

• AASM / Mindell, Kuhn, Lewin, Meltzer & Sadeh 2006 — Behavioral treatment of bedtime problems and night wakings in infants and young children (AASM review), SLEEP 2006;29(10):1263-1276 — aasm.org
• Gradisar, Jackson, Spurrier, Gibson, Whitham, Williams, Dolby & Kennaway 2016 — Behavioral Interventions for Infant Sleep Problems: A Randomized Controlled Trial, Pediatrics 2016;137(6):e20151486 (PMID 27221288) — pubmed.ncbi.nlm.nih.gov
• Price, Wake, Ukoumunne & Hiscock 2012 — Five-year follow-up of harms and benefits of behavioral infant sleep intervention, Pediatrics 2012;130(4):643-651 (PMID 22966034) — pubmed.ncbi.nlm.nih.gov
• Korownyk & Lindblad 2018 — Infant sleep training (Tools for Practice), Canadian Family Physician 2018;64(1):41 (PMID 29358251) — pmc.ncbi.nlm.nih.gov
• Canadian Paediatric Society (Caring for Kids) 2024 — Healthy sleep for your baby and child (parent handout, updated November 2024) — caringforkids.cps.ca
• Canadian Paediatric Society 2025 — Sleep matters: Supporting healthy sleep for children and youth with neurodevelopmental disabilities (NDDs), Mental Health and Developmental Disabilities Committee (posted August 19, 2025) — cps.ca

This is general education, not medical advice — talk to your child’s doctor about your child’s specific situation.

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