EatingFeeding a baby on a strict schedule every three or four hours is now considered rather old-fashioned advice. It is usually thought to be much better to instead feed your baby "on-demand," when she is hungry. While this may mean having to breastfeed your baby every 1 1/2 hour at times, it will usually balance out with other times when she goes three or four hours without eating. The key to "on-demand" feeding is to only feed your baby when she is hungry, and not simply because she is crying. Using this method, she will quickly move to a more regular schedule that fits her needs and temperament.
SleepingParents are often surprised by how much their newborn baby will sleep. In fact, the average one to two week old baby will likely sleep for about 16 1/2 hours a day. Of course that won't all be at one time, but hopefully you will get one stretch of four of five hours, and then shorter periods of two or three hours of sleep at a time.
Keep in mind that some babies sleep a little more and some a little less than these averages. However, your baby usually shouldn't go more than four or five hours without eating until she is gaining weight regularly and feeding well.