At one week, she'll sleep about 16 hours a day, more or less evenly spaced throughout a 24-hour period. Unfortunately, not much is known about what, exactly, causes the syndrome. There is, however, growing evidence that certain practices and habits may reduce a baby's risk. My newborn won't sleep on her back, but I know I shouldn't lay her on her stomach while she's asleep. This is a tough one.
Many infants prefer to sleep on their tummies because doing so relieves gas pains.
This may be the holy grail of new parenthood. The truth is, as with everything else about parenting, there isn't one single way that works for all babies. When the parent goes in, he or she stays for a minute or two, reassuring their baby verbally and with a minimum of physical contact. If the crying continues, the parent waits 10 minutes before going back in, following the same protocol. For third and subsequent visits, Mom or Dad waits 15 minutes before going into Baby's room.