Why Infants Get Cold Faster and How to Dress Them Right
How do you dress your baby when it turns cold? We explain why layering, a hat, and a sleep sack matter so much in everyday life with a newborn.
Written by Wetterbaby Editorial Team on May 14, 2025
“Is my baby too cold, or too warm?” In the first months, this question comes up daily. It has a real basis, because infants sense temperature differently from adults, and for measurable reasons.
Why Babies Get Cold Faster
A newborn has a large body surface area relative to their weight, so heat is lost faster. For shivering, the way adults counteract cold, they lack the muscle mass. The nervous system is still immature, and temperature regulation isn't running smoothly. And the brown fat tissue, the special “heating fat” babies do have, doesn't last long against real cold. The head, hands, and feet cool the fastest, which is why a hat, mittens, and thick socks belong in the outdoor outfit, depending on the weather.
Overheating Is Just as Risky
The other side is easy to overlook: too much warmth is at least as dangerous as too little. An overheated baby doesn't necessarily sweat visibly. They become restless or noticeably drowsy, signals that are easy to misread. Studies show overheating is a risk factor for sudden infant death syndrome (SIDS). So more isn't automatically better when dressing. For sleep, that means: no hat in bed.
The Solution: Layering
Several thin layers can be put on and taken off flexibly. As a rule of thumb: in the first months, one thin layer more than you're comfortable wearing yourself. If you go out in a sweater and jacket, your baby wears a bodysuit (onesie), a footed sleeper, and a snowsuit. Checking your baby's neck tells you whether it fits: place two fingers on the back of your baby's neck, and it should feel comfortably warm, not cold, not sweaty. Cold hands, by contrast, are normal for babies and not a reliable signal.
The Wetterbaby app provides the daily clothing recommendation based on weather and the child's age, along with the UV index for sunny days.
Ultimately it's a balance you learn quickly with a little practice: enough protection against the cold without falling into the overheating trap. The neck shows every day whether you've struck it.
Source:
Helios Gesundheit, Why babies get cold faster (in German)
