It is important to know how old your baby is. A healthy newborn usually sleeps around 18-20 hours a day. Some healthy newborns sleep the whole day and remain awake the whole night. As he/she grows up there is changes in sleep pattern i.e sleep time is gradually decreased with the advancement of age.. When becomes an older child, sleep will be confined to a particular time of a day like at noon, at night or after heavy physical activity. Sleep pattern of every child is individualized. If your child has normal growth, weight gain, activity and play, no matters how many hours he/she sleeps.