<s>[INST] my 4 month old infant has had a yellow watery diarrhea for 6 days now, goes about 4-5 times a day.... but today she was better  only twice...only, the last diarrhea was alot and had little black, greasy spots present.. i never saw that before.....can you tell me what that is? [/INST] Hi, I am sorry for the watery diarrhea your 4 month old infant is having. Yellow watery diarrhea 4-5 times/day, going on for 6 days now is a sign of possible food allergy or bowel infection. The black, greasy spots present could be parts of undigested food especially if formula milk is given to your baby. I highly recommend to send her to your pediatrician and run stool examination and culture to determine the right cause. Keep good hygiene when preparing his milk (if formula) or when breastfeeding. Wish fast recovery. </s>