Hi there, My name is Jacqui. my 4 month old son was breast fed for 7 weeks and then i had to put him on formula. He has been on Nan since then, which i have had no problems. just a few days ago we changed the type of nan he was on, to a new improved one they say (i dont have the details sorry) it seems to be a bit of a thicker formula, he doesnt gulp the formula down anymore, he drinks then stops then starts again. i just saw in his stool, which is a very dark green in colour. A little loose but not too bad - pretty normal in texture, but then it had a lot of tiny white balls in it? that is what i am concerned about - should i go back to the previous nan he was on. or is this normal? Thank you very much.