A 20-day-old baby is a newborn baby and sleeps for a long day, usually around 18 hours. A 20-day-old baby is not full-term and is often in a state of eating and sleeping and waking up to eat again after sleeping. At this time, the baby’s body grows faster and sleeps relatively long hours a day, usually around 18 hours. Babies usually need to sleep 4 times during the day, for about 2 hours each time, and generally need to sleep 10-11 hours at night. Apart from feeding, changing diapers and playing, most of the time is spent sleeping. However, there are a few babies who do not like to sleep and may not sleep for 18 hours. If the baby has no other abnormal performance, it is usually not necessary to pay too much attention to it. Parents are advised to massage the baby’s body and hug the baby more often to increase the baby’s sense of security and make the baby sleep more solidly. Give your baby more water and pay attention to indoor ventilation to avoid inducing other diseases such as prickly heat.