At my baby's 2 week appt the Pediatrician said I didn't have to wake up my baby every 2 hours at night anymore because she gained almost a pound in one week. Lol He said to only wake her if she sleeps past 5-6 hours at night but he doubted she would even sleep that long. I was pretty diligent about waking her up every 2 hours even at night because she lost so much weight in the beginning.