My baby sleeps a lot

My daughter was born on the eleventh, and she only wakes up every four hours and it's iust to eat or have her diaper changed and then she falls asleep again and then I lay her down 20 minutes after she wakes up.   Every four hours she is awake for only 20 minutes or so. And for bedtime I lay down, suddenly she wants to eat again, and then I feed her and she goes back down for another two hours.   Four hours in the day and two hours in the night.   AHH!