Quick answer

Keep the room at a comfortable temperature, dress your baby in one simple layer, and choose sleepwear with a known warmth rating. If you use a TOG 1 sleep sack, pair it with footed pajamas or a light bodysuit, not both plus a blanket. Check your baby's chest or back, not their hands, to judge warmth.

Set the room first, then dress for it

The room does most of the work. A comfortable baby room temperature for sleep is usually around 68–72°F (20–22°C). If you can't control the thermostat, adjust the sleepwear instead of adding blankets. A small thermometer near the crib takes the guesswork out of middle-of-the-night decisions.

Dress your baby in one layer under the sleep sack. That usually means footed pajamas or a bodysuit, depending on how cool the room runs. Two heavy layers plus a sleep sack is a common cause of overheating.

Layer with TOG in mind, not by feel

TOG is a warmth rating, not a thickness contest. A TOG 1 sleep sack is a mid-weight option for typical room temperatures. If the room is warmer, use a lighter TOG or just a bodysuit. If it's cooler, add a layer under the sleep sack before you consider a higher TOG.

Avoid the trap of adding a blanket over a sleep sack. A sleep sack is designed to replace loose blankets, and adding one back defeats the purpose and increases the risk of overheating.

Check your baby, not the clock

Feel your baby's chest or back. It should feel warm, not hot or damp. Hands and feet often feel cooler than the core, so they are not a reliable guide. If the chest is sweaty or the back of the neck is damp, remove a layer.

A flushed face, rapid breathing, or a heat rash are baby overheating at night signs that mean you should cool things down right away. If your baby seems lethargic or is hard to wake, treat it as an emergency and seek medical help.

Diagnose the warmth problem

  • Sweaty chest or damp neck: Your baby is too warm. Remove one layer, such as the footed pajamas, and leave just a bodysuit under the sleep sack. Check again in 20 minutes. If the room is already cool and this keeps happening, your sleep sack may be too warm for your baby.
  • Cool chest and back, but warm hands: Hands are not a good gauge. If the chest and back feel warm, your baby is likely comfortable. Do not add a layer just because the hands feel cool. Trust the core, not the extremities.
  • Waking often and fussy: If your baby wakes frequently and feels cool to the touch on the chest, add a base layer under the sleep sack. If they wake and feel hot or damp, remove a layer. Adjust one variable at a time and give it a few nights before changing again.
  • Flushed, rapid breathing, or heat rash: These are clear baby overheating at night signs. Cool the room, remove layers, and offer fluids if your baby is old enough. If symptoms do not improve quickly or your baby is hard to wake, seek medical care. Overheating is a safety issue, not just a comfort issue. Act promptly.

Sleepwear that supports safe warmth

  • Cormorant - CloudBlend™ Sleep Sack TOG 1: Cormorant - CloudBlendTM Sleep Sack TOG 1 is a wearable blanket made from CloudBlendTM fabric. A TOG 1 rating gives you a clear starting point for layering, so you can adjust the room or the base layer instead of guessing.
  • Ringo - CloudBlend™ Footed Pajamas: Ringo - CloudBlendTM Footed Pajamas are footed jammies made from CloudBlendTM fabric. Footed pajamas cover the feet, so you can skip socks and keep the layer count simple under a sleep sack.
  • Elwyn - CloudBlend™ Footed Pajamas: Elwyn - CloudBlendTM Footed Pajamas are footed jammies made from CloudBlendTM fabric. A second footed option lets you rotate sleepwear for laundry day without changing your baby's layering routine.