Newborns tend to sleep a lot. Their sleep is still immature and driven by the basic needs. It is coming for newborns to sleep from 14 to 18 hours a day. During this stage, as long as the baby is still waking up for feedings, a mother shouldn’t be too concerned. Past the newborn stage, a baby will likely be sleeping for 13-15 hours a day.
You can refer to this chart as a guidelines on how many hours a newborn sleep.
Most of the newborns tend to sleep for 16-18 hours a day.