How to sleep train your baby

Sleep training is a set of methods for teaching a baby to fall asleep without being fed, rocked or held, usually from around four months. It is a parental choice, never a medical requirement. The approaches differ mainly in how much crying you are willing to allow, and doing nothing remains a legitimate option.

What sleep training actually means

The skill being taught is narrow. A baby who can fall asleep on her own at bedtime can usually resettle herself when she surfaces between sleep cycles at 1am, instead of needing the same rocking or feeding that got her down in the first place. Everything else people attach to the phrase is noise.

It does not mean leaving a hungry baby. It does not mean never going in. And it does not mean the baby stops waking, since all babies surface during the night, as do adults.

The NHS, in its guidance on helping your baby to sleep, puts most of its weight on a consistent wind-down routine and on putting a baby down drowsy rather than fully asleep. That is the foundation under every named method below, and for a fair number of families it is the only thing needed. Gentler groundwork on baby sleep is worth trying before you commit to a formal approach.

From what age is sleep training appropriate?

Four months is the usual floor. The American Academy of Pediatrics, on its HealthyChildren site, describes babies becoming capable of longer consolidated stretches at around that age, as night feeds reduce and sleep patterns mature. Before that, waking is how a newborn eats and your job is to feed her.

Use corrected age if your baby was premature. Ask your paediatrician or polyclinic doctor first if she was premature, has reflux, is not gaining weight well, or has any medical condition that affects her breathing or feeding.

Nothing obliges you to do this at four months, or at eight, or at all. Sleep training sits in the same category as weaning schedules and screen rules: a family decision, shaped by what your household can sustain. A mother returning to work on a shift roster has a different calculation from one with her own mother living downstairs.

Safe sleep comes first, whatever method you pick

No approach to settling changes the safe sleep rules, and several of them become more important once a baby is being put down awake and alone. HealthHub, the Health Promotion Board's health portal, and the American Academy of Pediatrics agree on the essentials: on her back, in her own cot, on a firm flat mattress, with no quilts, bumpers, soft toys or loose bedding anywhere near her face.

Keep the cot in your room for the first months. Check the cot slats, the mattress fit and anything hanging within reach before the first night of any new routine. Cords from blinds and mobiles come down.

The main approaches, including doing nothing

Methods are usually ranked by how much crying they tolerate. Pick the one you can carry out consistently at 2am when you are tired and your partner has an early meeting, since consistency matters more than which name you choose.

Doing nothing

Night waking resolves with age in most children whether or not anyone intervenes, and a family that is coping does not owe anyone a programme. Nursing or carrying a baby to sleep is the norm across much of Asia and remains common in Singaporean households.

The cost is time and your own sleep. The benefit is no crying and no conflict with whoever in the family thinks sleep training is cruel.

Pick up, put down, and the chair method

Both aim to teach the skill while keeping you visibly present. Pick up, put down is physically tiring and tends to suit younger babies. The chair method asks you to sit in sight, reduce your response gradually and shift the chair towards the door over a week or two, which some babies find reassuring and others find maddening.

Graduated checks and full extinction

The Ferber approach sends you back into the room at intervals that lengthen each night, to reassure with your voice or a hand on her back rather than by lifting her. Full extinction skips the checks. Both are hard on parents in the first few nights, and both require that the adults in the flat have agreed in advance, because a rescue at minute 12 teaches only that crying works for 12 minutes.

What the evidence does and does not show

Be sceptical of numbers. Cochrane, which assesses the quality of evidence behind interventions like these, treats behavioural sleep interventions in infancy as an area where the research is limited and the findings are mixed, which is why no article can reliably tell you how many nights it will take or quote you a success rate. The legacy version of this page quoted one; it has been removed.

What can be said is modest. Some families see improvement within a week or two. Others see none and stop. Teething, a cold, a trip to see relatives or a growth spurt can all undo progress temporarily, and that is normal rather than failure.

Setting up the room in an HDB flat

Space is the first constraint. In a three-room flat the cot stays in the parents' bedroom for a long time, which suits safe sleep guidance and makes graduated checks awkward, since you are the thing she can hear breathing. Many parents here use a cot against the far wall with a curtain, screen or wardrobe breaking the line of sight.

Temperature is the second. The NHS advises a baby's room at 16 to 20 degrees Celsius, a range written for British homes that no bedroom here reaches without the aircon running all night. Aim for comfortably cool instead. Set the aircon around 25 or 26 degrees Celsius, point the fan at the wall rather than at the cot, dress her in a single light layer, and judge the result by feeling the back of her neck rather than her hands, which are cold on almost every baby.

Darkness and sound do the rest. Blackout curtains matter less here than in countries with long summer evenings, though they help with the 7am glare on an east-facing block. A fan on low gives you steady background noise that masks the lift lobby, the corridor gate and the neighbour's renovation.

Getting the household and the neighbours on side

Everyone in the flat has to run the same bedtime. Grandparents who carry the baby to sleep every afternoon, a helper who rocks her through the evening, a husband who caves at the first whimper: any of these will stretch a fortnight into a month. Talk it through before the first night and give people a role they can keep, such as the bath, the feed or the story.

HDB walls are thin, and the fear of a neighbour complaining stops a lot of parents before they begin. Tell them first. A short message to the units either side and above, saying you are working on your baby's sleep and it may be noisy for a week or so, usually buys goodwill rather than complaints. Most neighbours have either done it themselves or have been the baby.

When to talk to a doctor instead of trying harder

Some sleep problems are medical, and no amount of consistency will fix those. Loud snoring, pauses in breathing, mouth breathing, choking or arching in pain after feeds, poor weight gain, or a baby who is distressed for hours and inconsolable all belong in front of a doctor rather than in a sleep plan. KK Women's and Children's Hospital assesses children's sleep problems and your polyclinic can refer you. Colic symptoms are worth ruling out too.

Your own state counts as a reason as well. If you have reached the point where the nights feel unbearable, read what to do about sleep deprivation while breastfeeding and raise it at your next appointment.

Pick a start date and write it on the calendar, ideally a Thursday so the hardest nights land on a weekend. Then tell whoever else lives in the flat, before you tell the neighbours.