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.
Newborns typically sleep 14 to 18 hours a day in the first week and 12 to 16 hours by the time they're a month old. Unfortunately, even if your baby is a sleep glutton, you may find yourself staggering around like a wet dishrag.