Eh, grey stool in 2-month-old baby memang kena check with doctor, sayang. Better don't wait, call your clinic or go see the pediatrician this week, okay? Stool color changes are normal tapi grey is one color kena monitor closely. A few of my mum friends kena refer to doctor jugak when their babies' poop color changed jadi weird, don't stress, tapi best to get it checked out properly. How's baby acting otherwise, eating well and active still?