My 6 weeks old daughter lately is being nursing constantly all day, every hour or less. At night I need to wake her up because she was as sleep for almost 4 hours straight. She only sucks for 4 minutes and fell back to sleep. After 2 hours I wake her up again and she did the same. She fuss after she breastfeed until she fall back to sleep. She have a lot of wet and soiled diapers but I'm concern is she is eating enough. How I can know for sure how much she is eating? My breast feel softer after she nurse. She is reaching all the milestones for her age (lot of smiles, cooing, getting bigger etc. So Is normal to be so concern? Any Advice? I always feel like she is not eating enough .