My 4 week old is a very sleepy baby and always falls asleep at the breast after only 10 mins of nursing. I then usually change her diaper to wake her up and try for some more, but she usually spits up before or after her 2nd go around. She has had yellowish-green poop (after every feeding) for about 5 days which tells me she might not be getting any hindmilk in her feelings. I am worried because although she's gained 2.2 lbs since she was born, she hasn't gained any weight in a week. I'm also worried that these short "snacks" are going to effect my milk supply and its going to dip. Anything to worry about?