Yes， 4-month-old babies can sweat. Sweating is the body’s natural way of regulating temperature. Babies’ body temperature regulation is not as efficient as adults， and they are more susceptible to overheating or becoming too cold. This is why it is important to monitor your baby’s temperature and dress them appropriately for the weather.
As babies grow， their sweat glands develop， and they start to sweat more. However， at four months old， sweat production is still not as developed as it will be later in life. Babies will sweat during exercise or when they are hot， and they will sweat on areas of their body that generate the most heat， such as the head and neck.
It is important to remember that babies lose heat through their skin at a much faster rate than adults do， which means they can become cold quickly. When dressing your baby， it is important to remember that they may need an extra layer of clothing compared to what an adult would wear in the same temperature.
If your baby is sweating excessively or seems overly warm， it is important to take steps to cool them down. This can include removing an outer layer of clothing， placing a cool damp cloth on their forehead， or moving them to a cooler room.
In summary， 4-month-old babies can sweat， but their sweat glands are not as developed as they will be later in life. It is important to monitor your baby’s temperature and take steps to keep them cool when needed.
