<s>[INST] My 3 week old has green stools and won't sleep for more than 30 minutes at a time.  And, she's been spitting up more often.  This started Tuesday night.  I haven't eaten anything out of the ordinary, and I make sure that when I nurse her, she completely finishes before I switch her to the other side. [/INST] Green stools are extremely normal in children of this age. It is not a cause of concern. It occurs due to rapid transit of the fecal matter through the large intestines and so the bile pigments do not get the time to get converted to the yellow pigment of stool. You need not worry. Just continue breast feeding as usual.Sleeping habits of babies may vary and you need not worry about that too. </s>