DS is 16 months and is starting in some of this behaviour. He gets very frustrated very quickly, screams and usually bites his hand or something close by - so far objects not people thankfully. He's not got any words yet and doesn't respond to our questions indicating yes or no so it's a bit of guess work to be done as to what's bothering him. Given he's only 16 months I am a little concerned about what's ahead. He was such an easy, happy person until about a month ago when this all started. It's as if he's making up for lost time.