I have a very sociable, very active and mainly happy baby. In the last month she has started to get very angry, impatient and either screams or shouts out. Its getting to the point where I worry she may have a behavioural problem and she can get very loud and angry when we are out in groups at 'baby bounce' or music groups and its embarressing. Its as if she's started the terrible twos early! Has anyone else experienced this? Any advice??