Babies aren’t born with a body clock, which is why newborn baby sleep comes in short chunks spread across day and night for the first six weeks or so. Then, at around 2 to 3 months, the clock starts running: cortisol and melatonin begin to follow a day-night pattern, and longer night stretches appear. Your job while it matures: bright days, dim nights, and a safe sleep space every time.
Malaysia makes the light part easy. This close to the equator, sunrise and sunset move by only about half an hour across the year, so a bedtime that works in March still works in November. The hard parts are local: aircond rooms, the TV on until late, and the buai your mother-in-law swears by.
How a baby’s circadian rhythm develops
| Age | What’s happening |
|---|---|
| 0–6 weeks | No clear 24-hour pattern. Breastfed babies get some of mum’s night-time melatonin through milk before they make their own. |
| 8–15 weeks | Cortisol rhythm at about 8 weeks and melatonin a week later, as night sleep settles (35-baby UK study). A 163-baby study put melatonin at 9–15 weeks. |
| 3–6 months | The NHS says some babies sleep 5 to 8 hours or longer at night, “but not all”. |
Count from the due date for a baby born early. A 10-week-old still waking every three hours isn’t behind.
Bright days
Light is the strongest signal the body clock gets. In a UK study of 56 babies aged 6 to 12 weeks, the ones who slept better at night had been exposed to about twice as much light between noon and 4pm. That’s an observational link, not proof, but daylight is free.
Open the curtains in the morning, do daytime feeds and naps in a bright room, and walk round the taman. The AAP says to keep babies under 6 months out of direct sun, so use shade, the stroller canopy and window light.
That is not the same as jemur. Window sun is not a safe or recommended way to treat or prevent jaundice; see should you sun your newborn for jaundice or vitamin D and the sunlight hub.
Dark, dull nights
The NHS advice: keep night feeds dim and quiet, change the nappy only if needed, and put your baby back down without play. A cordless blackout blind such as IKEA TRETUR helps with early sun on east-facing windows and with daytime naps, with no cord hanging near the cot.
Night lights, honestly. The eye cells that signal the body clock respond most to blue light (446–477 nm in adult studies) and far less to longer wavelengths. Young children are sensitive: in 3- and 4-year-olds, an hour of light as dim as 5–40 lux before bed cut melatonin by about 78% on average. Nobody has tested red night lights in babies, so a dim red or amber light, on only for the feed, is a reasonable bet rather than a sleep aid. The IKEA TÖVÄDER has a red mode and a fade-out timer; keep it on a shelf, not in the cot. For toddlers, dim the lights and put screens away an hour before bed.
Safe baby sleep: the AAP rules for every nap and night
Naps at Nenek’s house and the taska count too.
- On the back, every nap and every night.
- Firm and flat: nothing inclined more than 10 degrees, a mattress that fits the cot tightly, and a fitted sheet only. If your baby falls asleep in the car seat, stroller or buai, move them to the cot as soon as you can.
- Empty cot: no pillows, bantal peluk, bumpers, nests, toys or weighted sacks.
- Room-share, don’t bed-share, for at least the first 6 months. Never doze with your baby on a sofa or armchair, where the AAP says the risk is up to 67 times higher.
- Stop swaddling once your baby looks like they’re trying to roll.
- Don’t overheat: no hats indoors, and use our TOG chart for a 22–28°C aircond room rather than piling on layers.
- A dummy at sleep time lowers SIDS risk; if breastfeeding, wait until feeding is established.
What to buy, and what to skip
Most nights need a sleep sack in the right TOG and, for the newborn weeks, a muslin or zip swaddle you’ll retire at rolling. Under it, one breathable layer from the cotton and linen hub.
Skip weighted sleep sacks, sleep positioners and nests, cot bumpers, inclined sleepers and baby pillows. Skip anything sold to reduce SIDS; the AAP says there’s no evidence it works, and a breathing monitor doesn’t replace the rules above.