my 5 month old for the last 2 1/2 weeks has had dark grayish, blue-green, dark greenish poop that smells extremely bad it also is like clay. most of the time its in one mush and she is going every other day it's just so thick. she is only on formula so no solids, pees normal and eats normal. her pedi nurse said to give pear or prune juice, i have plus apple no change. once in a while she will have a watery one but it's rare. i am a first time mom what do i do ? thanks