M.K.
Hi T.. All babies become more and more fussy and difficult to soothe from their due date up through their 6th week. Week 6 can be pretty tough! After that 6 weeks, about 80% of babies will begin to settle down. The other 20% will be fussy and difficult to manage until 3 to 4 months old. These types of babies (the 20%) are usually called "colicky infants," even though it has nothing to do with stomach or medical issues. Assuming there are no other medical issues, symptoms or concerns, I would give your baby a couple more weeks (when she turns 7 weeks old) to see what happens.