Effectiveness is the capability of producing a desired result. When something is deemed effective, it means it has an intended or expected outcome, or produces a deep, vivid impression.
The average newborn sleeps about 16 hours a day, but some need much less sleep and some much more. Also, it's not uncommon for a newborn's sleep pattern to change from day to day; he may sleep substantially less than usual one day and then catch up by sleeping more the following day.
A newborn infant will require up to 16 hours of sleep per day. This requirement drops to approximately 13 hours per day from the age of 6 months up to 3 years. Once a child reaches age 3 the need for sleep drops about two hours per day until they reach age 6. From age 6 to 9 the average child needs 10 hours of sleep.