My baby has green foul smelling mucosy poop for the past 9 days and frequency is thrice aday?

Gastroenteritis: There have been several viruses, both the norovirus (the cruise ship virus) and rotovirus going around. Both can cause smelly, gross stools that can last a little while. Depending on the age of your baby, a good probiotic and a day or so of pedialyte may elp return things to normal. However, if there are other symptoms, contact your doc to make sure there isn't a stool bacteria or parasite.