What Should a 3–6 Month Old Wear to Bed at 16°C?

Where 16°C sits on the TOG scale

16°C is the bottom of the 2.5 TOG band, which runs from 16°C to 20°C — below 16°C the recommendation steps up to a 3.5 TOG bag, and at 21°C it steps down to 1.0 TOG. Those bands line up with the major Australian sleeping-bag makers' charts (ergoPouch's chart puts 2.5 TOG at roughly 15–20.5°C); Red Nose Australia publishes no TOG bands and tells parents to check the maker's guide. Separately, 16°C is also the floor of the 16–20°C range often quoted as a general comfort guide for a baby's room — a room-temperature guide, not a TOG band, even though the numbers happen to match. At 16°C you're within that comfort range, unlike at 15°C where the primary answer is to warm the room, and a 2.5 TOG bag with a warmer base layer is the right match for a room at its cool edge.

For a 3–6 month old, the combination at 16°C is a long-sleeve singlet under a long-sleeve cotton bodysuit or footed pyjamas, inside a 2.5 TOG sleeping bag. The long-sleeve singlet is what the cool end of the band calls for; from 18°C a plain singlet is enough. If the room reliably falls below 16°C overnight with no heating, the 3.5 TOG bag — with a singlet under a long-sleeve bodysuit or pyjamas — is the next step. If it hovers right around 16°C, the lighter option is generally the safer one: stay with the 2.5 TOG combination and let a check of their back or tummy tell you whether it's enough.

The rolling note still applies at this age: many babies show rolling signs by 4–5 months, and wrapping should already have stopped — at 3 months or at the first signs of rolling, whichever comes first — so the fitted sleeping bag is the right call. A well-fitted 2.5 TOG bag moves with the baby safely.

Signs you've got it right (or wrong)

At 16°C, chilling is the more likely risk. Check their back or tummy — warm to the touch is what you're looking for. A cool back or tummy at this temperature is worth acting on promptly: check the room temperature first. If it's dropped below 16°C, the room has left the 2.5 TOG band and the 3.5 TOG bag is the better match for the next sleep; if it's down to 14°C or below, heating becomes important too. Hands and feet run cool in any well-regulated baby, so ignore those.

Overheating is less likely at 16°C, but can happen if a portable heater warms the room significantly during the night — particularly if the room climbs to 18°C or above while baby is still in the long-sleeve singlet, or past 20°C in the 2.5 TOG bag. If you notice damp hair around the hairline or flushed cheeks in a room that's warmed up, swap the long-sleeve singlet for a plain singlet on the next sleep; if the room is sitting at 21°C or above, drop to a 1.0 TOG bag instead. Having both a 2.5 and a 3.5 TOG bag accessible is practical in any home where the bedroom temperature is variable.

Layering for 16°C in an Australian home

In concrete terms: a long-sleeve singlet under a long-sleeve cotton bodysuit or footed pyjamas, inside a 2.5 TOG sleeping bag (if the room is below 16°C, that becomes a singlet and long-sleeve bodysuit or pyjamas under a 3.5 TOG bag). The ergoPouch 2.5 TOG sleeping bag is one of the most widely available options in Australian stores. Natural fibres — cotton, bamboo, merino — regulate temperature better than polyester in a cold room, so check fabric labels when buying layers.

In the Adelaide Hills — Stirling, Crafers, Aldgate, and the wider Mt Lofty Ranges — winter bedroom temperatures of 16°C are common, and the elevation adds 2–4°C of chill compared to Adelaide CBD. Many of the Hills' older brick homes from the 1950s and 1960s have limited insulation and no central heating: the reverse-cycle in the living area doesn't carry through to bedrooms. If you're in an unheated Hills bedroom at 16°C, the room will typically drift lower through the night — and once it's below 16°C, it's in 3.5 TOG territory. If you know your bedroom does this every night, starting in the 3.5 TOG combination makes sense; if it holds around 16°C, the 2.5 TOG combination is the right match.

When room temperature shifts overnight

In the Adelaide Hills in winter, a 16°C bedroom at 7pm is often the warmest it will be that night. Without bedroom heating, temperatures in the ranges can fall to 13–14°C by pre-dawn — particularly in older homes that lose heat steadily, and in elevated suburbs like Stirling where cold air pools overnight. At that point the room has dropped out of the 2.5 TOG band and into territory where the 15°C guidance applies: a 3.5 TOG bag with a singlet under a long-sleeve bodysuit or pyjamas is the match, and heating the bedroom toward 18°C, if practical, is worth considering for the next sleep.

If your room instead holds at 16°C all night — good insulation, or passive warmth from adjacent living areas — the 2.5 TOG combination is the right match all the way through. Check their back or tummy at the first night feed: if it feels cool, the room is colder than you thought and the 3.5 TOG bag on the next sleep may be more comfortable; if it's damp, swap the long-sleeve singlet for a plain one. Knowing what your home does overnight takes about a week of observation and a cheap room thermometer.

Frequently asked questions

Try a different temperature or age

• What a 3–6 month old should wear at 15°C
• TOG rating chart: which TOG for which room temperature