Yes， it is perfectly normal for a baby to start sweating at around 20 days old. Sweating is a natural process that helps regulate body temperature and prevent overheating. While newborns do not have a fully developed sweat gland system， they still sweat through their pores， and it is， therefore， essential to monitor their body temperature and avoid over-dressing them.
If you notice that your baby's skin appears to be damp， clammy or feels warm to touch， it would be best to remove a layer of clothing， place them in a cooler environment or use a fan to help regulate their temperature. Also， ensure that your baby is well hydrated， especially if you live in a hot and humid environment， as they can become dehydrated quickly.
It is important to note that excessive sweating or sweating that is accompanied by other symptoms such as fever， rashes， or lethargy， could be a sign of an underlying medical condition such as an infection or dehydration. If you notice any unusual sweating patterns in your baby or any other symptoms， consult a doctor immediately.
In conclusion， sweating is a customary occurrence in babies， and it is usually nothing to worry about as long as proper care is taken to regulate their body temperature and ensure their well-being. As always， it is important to keep a close eye on your baby's health and seek medical advice if you're concerned about something.
