Karina at 3 weeks

So what is Karina doing at 3 weeks? Well she isn't sleeping too well. She eats every hour and falls asleep eating. Then I lay her down and she wakes up and stays awake until the next feeding. She then falls asleep while she is eating again! So basically she isnt getting full meals because she always falls asleep while eating. But then doesnt stay asleep unless we are holding her so she stays awake for hours at a time. At night, she is sleeping about 2 hour intervals but she sleeps in the bed with me because when i put her in her crib, she wakes up and cries.