My son is 2 months and 4 days old. He is formula fed. he does potty once everyday and it is a mixture of green and yellow from the beginning. But from last few days I observed that the green colour is somewhat looking like grey. also the yellow part has been reduced. I have attach a picture of it. he is in nan pro 1. his hunger and urine output is normal. i am giving him neopeptine drops twice a day for gas problem. please look at the picture and let me know whether its a cause of concren or not.Thanks