The ideal nursery temperature and humidity for babies and toddlers (0-4)

The short version: you'll see a comfortable range cited a lot, roughly 16 to 20 degrees, with humidity somewhere around 40 to 60 percent. It's worth knowing those numbers exist. But the real point isn't chasing a figure, it's dressing your little babe for whatever your environment is actually doing. Here's the calm version, no guesswork.

Your little babe can't regulate their temperature the way you can. That's not a scary fact, it just means the environment around them does more of the work, and knowing the comfortable ranges takes a lot of the second-guessing out of it.

What temperature should your babe's environment be?

You'll see a comfortable range floated around a lot, roughly 16 to 20 degrees (although this varies a lot!). Yep, it's worth knowing that number exists. But here's our honest position: we don't prescribe a range or desired temp, and neither does Red Nose. There's no magic temperature for safe sleep. What matters is dressing your little babe for whatever your environment is actually doing. Not everyone can change their environment, and that's completely okay. Maybe there's no heater, or the room sits at 15 on a cold night. You don't need to chase a number, and we can't stress that enough. You just need to know what the number is, so you can dress your babe right for it. That's the whole point, and it's exactly what Orbie is for.

What about humidity?

Humidity is the half of the nursery climate almost no one talks about. A commonly cited range is roughly 40 to 60 percent, a helpful target to gently aim for rather than a hard rule. Air that's very dry can leave little noses and skin feeling it (hello eczema); air that's very damp attracts mould and dust mites, and can make a room feel even hotter than it actually is. Somewhere in the middle is the comfortable zone.

Why cot-level readings can differ from the shelf

Heat rises. A reading taken up on a shelf, or from a device mounted on the wall, can sit a degree or two off from the air right where your babe actually sleeps. If you're going to measure, measure as close to cot level as you can. That's the temperature that's actually theirs.

This is where Orbie fits in. It reads temperature and humidity down where your babe sleeps and turns it into simple dressing guidance in the app, so you're not second-guessing a chart at 4am.

How the seasons change things

The comfortable range stays the same all year; the challenge changes. Winter is about warmth without piling on the layers, summer is about staying comfortable without a chill from the aircon. We go deeper on that in our seasonal sleep-environment guide.

How to know what to dress them in

Once you know the temperature, dressing your babe is mostly about matching it, usually with TOG-rated sleepwear. We've broken the temperature-to-TOG match down in a separate TOG guide so you can grab the quick version at bedtime.

This article is general information, not medical advice. If you're ever worried about your little babe, trust your gut and reach out to your GP, child health nurse, or Pregnancy, Birth and Baby on 1800 882 436.

Sources

• Red Nose Australia - What is a safe room temperature for a sleeping baby?
• Red Nose Australia - How to dress baby for sleep
• Bach V & Libert JP (2022). Hyperthermia and Heat Stress as Risk Factors for SIDS. Frontiers in Pediatrics. Read here
• Ionescu C et al. (2023). Relative Humidity and Its Impact on the Immune System and Infections. PMC. Read here
• Bureau of Meteorology. Climate Data Online. Australian Government. Read here