Baby is 6 weeks old and been fussy all day. not wanting to eat much, cries when eats. poop is mustard/seedy w/ dark mucus and a tiny blood. concern?

This may be fixable: This is the time and behavior associate with colic that is common. No one really knows the cause but I believe there are many different causes given a young infant digestive tract. Stools sound normal. As a normal stage, fussy times begin between 3 to 6 weeks, resulting in a unconsololable baby between 6/9 pm of age. These episodes usually last for one