I'm really starting to worry. My 4w DD still doesn't wake up to eat. She doesn't seem to know when she's hungry. I've been waking her up every 3 hours to eat during the day and letting her go longer at night, but she still doesn't seem to get hungry. She is gaining weight, has her poops and pees, but it's really hard to get her to eat (tends to take 45 minutes-1 hour to get 10-20 good minutes of eating). Is something wrong? Is she just sleepy? I don't know what to do!