Anyone know why my 10 week old son suddenly gets the screaming ab dabs for no discernable reason....a split second after smiling and gurgling at me. It normally happends in the evenings...although can happen during the day. He's fed, slept well and been entertained, is lying in my arms happy, then his face scrunches up and he lets rip for several minutes. The hairdryer seems to calm him eventually..........but Im confused by the sudden change. He hasn't been for a poo for just over two days, could that be it? I'm befuddled as he is a good baby most of the time and doing well n the EASY routine.