How Often Should You Change Your Baby's Cot Sheet?
Once or twice a week, sooner in humid weather, and immediately after any mess. If that's all you needed, you can stop here.
I'd like to say a bit more, though, because this is a piece of housework I dismissed for years before I understood how much it was doing for her.
Why cot sheets need changing so often
A cot sheet gets much dirtier than an adult's, because a baby spends twelve to sixteen hours a day on it. She sweats more per kilo than you do, dribbles constantly, and every so often leaks from one end or the other. Skin cells shed onto it and milk gets into the weave, all in a warm room.
In this climate that adds up faster than anywhere temperate. Damp cloth in a warm flat is exactly the environment dust mites want, and mite allergens are a well-established trigger for eczema and for asthma. Washing the sheet hot is the part of dust-mite control that reliably works.
That's no reason to worry. It's a reason to have a routine, and the routine takes about four minutes.
How often, by age
The frequency changes as your baby does, largely because what ends up on the sheet changes.
The rest of the bedding
| Age | How often | Change at once if |
|---|---|---|
| 0-3 months | Every 2-3 days | Any spit-up or nappy leak |
| 3-12 months | Twice a week | Weaning food or a nappy incident |
| Toddler | Once or twice a week | Illness, accidents, a very warm night |
| Any age | — | It's wet, marked, or smells of anything but fresh |
The last row overrides the rest of the table. If the sheet is wet, marked, or smells of anything other than clean cloth, change it, whatever the schedule says.
Does Singapore's climate change the routine?
It does, in two ways a guide written in London won't tell you.
The first is that humidity means a sheet that felt dry at bedtime can be faintly damp by morning, particularly if the room is air-conditioned overnight and then warms up. Damp is the thing to act on, so check by hand in the morning instead of counting days.
The second is that fabric choice counts for more here than in a dry climate. A sheet that keeps moisture against the skin all night feels quite different from one that moves it away, and in a warm room the difference isn't subtle. Bamboo viscose is the one we make and the one I use, because it's airy, it takes moisture off the skin, and it goes softer with washing and never stiffer.
Why I care about this, beyond the obvious commercial reason: Shan tossed and turned all night as a baby, and back then I never found out why. She's ten now and the answer is obvious. She's sensitive to materials, and she sleeps well in soft, thin, breathable cloth and badly in anything else. I didn't need to buy anything to find that out. I needed to change what was touching her and pay attention for a week, and it took me the better part of a decade to think of it. I still don't know why it took so long. So before you buy anything, try the free version: check the sheet you already own for stiffness, for a rough seam running under where she lies, and for fabric that feels warm to your palm. Wash it, dry it properly, and watch her for a week.
How many cot sheets do you need?
Three. You can manage with two, but sooner or later it'll cost you a bad night.
One on the mattress, one clean in the cupboard, one in the wash. With three, you can strip the cot at two in the morning and put a clean sheet straight on, without standing at the washing machine wondering what to do. That's the whole point of a spare.
A waterproof mattress protector under the sheet is the other thing to own, because it turns a leak into a two-minute job instead of a mattress you now have to dry in a humid flat. Anything that goes on the mattress must be firm, flat and fitted properly, with nothing loose, nothing bunched and nothing padded.
Pick a day and attach it to something you already do, which for us was Sunday, alongside the bins, for no better reason than that it was the day I'd remember.
Strip it and wash it at 60°C where the label allows. Dry it completely, because half-dry cloth in this climate will smell by Tuesday, and put the clean one straight back on. Keep the spares folded in the room the cot is in, so the middle-of-the-night version of you doesn't have to go looking.
That's the whole system. It isn't clever and it doesn't need to be.
Where this comes from
This guide is general information, written to help you understand a topic and ask better questions. It is not medical advice and does not replace your own doctor, midwife or paediatrician. Anything that worries you about your baby belongs with them.
Read next: Why You Should Use Bamboo Rayon Sheets for Your Baby's Cot · How Often Should You Change Your Child's Pillowcase or Buddy Pillowcase?
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