Five Baby Sleep Myths Every New Parent Hears (and What the Evidence Says)

I can clearly remember the moment I gave birth to my first child. I was absolutely buried in love and gratitude. And then, roughly fifteen seconds later, I was equally buried in advice. You should. You’ll want to. You’ve got to. All of it offered with the best intentions, and all of it overwhelming. That was my experience as a professional in this field. I can only imagine the tidal wave that hits a mum who openly asks for suggestions.

There is no such thing as a casual mum. Whether you are at home full time, working, or somewhere in between, your kids are on your mind around the clock, so we research, and the internet being what it is, we inevitably collect conflicting information. So let me take five of the most persistent sleep myths I hear in mums’ groups and parenting forums, and hold them up to the light.

Myth 1: Too much daytime sleep keeps babies up at night

Not likely, except in extreme cases. Newborns especially need enormous amounts of sleep. Up to around six months, I generally do not want to see a little one awake for more than about two to two and a half hours at a stretch, and for newborns the window is more like forty-five minutes to an hour.

What actually keeps babies awake at night, more than anything else, is overtiredness. It feels intuitive that an exhausted baby would sleep better, but the opposite is true. Miss the tired window and their little bodies kick back into gear with a surge of cortisol, which makes falling asleep and staying asleep genuinely harder. A baby who has napped well during the day is far more likely to settle well at night. If your little one is within age-appropriate totals, let them snooze.

Myth 2: Sleep is natural, so it can’t be taught

Sleep itself is natural, absolutely. Every human being, at every age, wakes briefly and returns to sleep multiple times a night. You cannot teach a child to be sleepy. What can be taught is the ability to fall back to sleep independently. The typical so-called bad sleeper does not need less sleep or wake more than other babies. They have simply learned to rely on outside help to get back to sleep each time they surface. Once a little one can drift off without that help, they string their sleep cycles together effortlessly, and that is the whole secret behind what parents call sleeping through the night.

Myth 3: Babies will set their own schedule

I wish this one were true. Babies’ sleep rhythms are wonderfully erratic when left entirely unregulated, and missing their natural sleep window by as little as half an hour can trigger that cortisol surge and send the day spiralling. Respond to your baby’s cues, always, but pair those cues with a gentle rhythm you hold for them. They need our help with this, the same way they need our help with everything else in these early years.

Myth 4: Sleep training damages attachment

This is the myth that keeps loving parents trapped in survival mode, so let’s be precise. The best-known randomised trial on this question, led by Michael Gradisar and colleagues and published in Pediatrics in 2016, followed families using behavioural sleep interventions and found significant sleep improvements with no adverse stress responses in the babies and no negative effects on parent-child attachment or child emotions and behaviour. A five-year follow-up of an earlier large trial found the same: no long-term harms.

How you support your child’s sleep should absolutely fit your values, and responsive approaches exist across the whole spectrum. But the claim that helping your child learn to sleep will damage your bond is not supported by the evidence.

Myth 5: Babies aren’t designed to sleep through the night, so don’t bother

It is true that night waking is biologically normal, especially in the first six months. Where this myth goes wrong is the conclusion, that nothing can or should be done when a family is drowning. Our little ones need our loving guidance through their early years, sleep included. Some babies are naturally gifted sleepers. Most need us to shape the conditions, hold the rhythm, and gently teach the skills. You are allowed to be in charge here, lovingly, because you know your family best.