The first weeks of sleep are full of love and worry in equal measure. The good news: a few simple, well-tested rules cover almost everything you need to know to lower the risk and rest easier. Here they are, in plain terms.
What does safe sleep actually mean?
Safe sleep is a short list of habits that lower the chance of sudden infant death (SIDS) and suffocation. You can remember most of it as the ABCs: babies sleep Alone, on their Back, in a Crib. Everything below is just the detail behind those three letters.
| The basics | Do this |
|---|---|
| Position | Always on the back |
| Surface | Firm and flat, fitted sheet only |
| The space | Empty — no pillows, bumpers or loose blankets |
| The room | Share a room, not a bed |
For the official version, see the NIH Safe to Sleep campaign and the Canadian Paediatric Society’s healthy-sleep guidance.
Why “back to sleep” for every sleep?
Putting your baby down on their back — for every nap and every night — is the most important thing you can do. Back sleeping keeps the airway clearest and is strongly linked to a lower SIDS risk.
- Side sleeping isn’t safe either, because babies can roll onto their tummy.
- Once your baby can roll both ways on their own (often around 4–6 months), you can leave them in the position they choose — but still always start them on their back.
- Tummy time is great for development, but only while your baby is awake and watched, never for sleep.
What kind of surface is safe?
Babies should sleep on a firm, flat surface made for infant sleep — a crib, bassinet or cot that meets current safety standards.
- The mattress should be firm and fit snugly, with only a fitted sheet on top.
- A surface is “firm” if it doesn’t indent when your baby lies on it.
- Avoid sleep on soft or inclined surfaces — sofas, armchairs, adult beds, cushions, car seats or bouncers for unsupervised sleep. If your baby falls asleep in a swing or seat, move them to a flat surface when you can.
A safe surface plus a steady rhythm makes the early weeks easier. Once feeds and naps start to settle, our baby sleep schedule planner can help you map out age-appropriate nap and bedtime windows.
What should (and shouldn’t) be in the crib?
The safest crib is a boring one. Keep the sleep space empty except for your baby:
- No pillows, quilts, duvets or loose blankets.
- No bumper pads, sleep positioners or wedges.
- No stuffed animals or toys.
To keep your baby warm without loose bedding, use a sleep sack (wearable blanket) or a thin, snug swaddle. Stop swaddling as soon as your baby shows signs of trying to roll. Dress them in one light layer more than you’d wear, and keep the room at a comfortable temperature — overheating adds risk, so skip hats indoors and heavy bundling.
Why share a room but not a bed?
Health guidance recommends your baby sleeps in your room, on their own separate surface, ideally for the first 6 months and up to a year. Being close makes feeding and comforting easier and is linked to lower risk.
Bed-sharing, on the other hand, raises the risk — especially for babies under 4 months, babies born early or small, or if anyone in the bed has been smoking, drinking or taking anything sedating. The safest setup is a separate crib or bassinet next to your bed. If you feed your baby in bed, move them back to their own flat, clear surface afterward rather than falling asleep together on a soft mattress, sofa or armchair.
A few extra things that help
- Offer a pacifier at sleep time once feeding is going well — it’s linked to lower SIDS risk.
- Keep the air smoke-free before and after birth.
- Breastfeeding, where it works for you, is linked to lower risk too.
- Routine vaccinations are also associated with a protective effect.
- Skip products marketed to “reduce SIDS” (special mattresses, monitors, positioners) — they aren’t proven and can give false reassurance.
None of this has to be perfect. The core rules — back, firm and flat, empty space, own surface in your room — cover the vast majority of it, and they get to be second nature fast.
Related reading
- Baby Birthstones and Zodiac Signs by Month
- Baby Eczema & Sensitive Skin: How to Choose Gentle Products
This is general information, not medical advice — check with your doctor or midwife about what’s right for your baby.
