DS2 is 3.5 years and I always thought he was pretty run of the mill in terms of his behavour (i.e. not too naughty but not an angel either). However, today I had some friends round for lunch with their 3 year old and one of my friends had her 17 week baby with her. While i was out of the room, apparently DS2 sat down on the end of the baby's baby bjorn bouncer and let it ping back up again.....apparently the other mothers told him not to do it and he did it again, resulting in the baby being thrown from the bouncer....I didn't actually see any of this happen but as I entered the room the baby was wailing, as was DS2 and the mother was yelling and swearing at him - then she started screaming at me that I needed to do something about DS2 as he is "completely f*ing out of control"....it was absolutely awful and I felt so dreadful for the poor little baby (who is thankfully fine). I told DD2 off and he was punished with no ice cream for pudding and I made him apologise, but unfortunately the mother is still very angry and thinks that he has a problem with antisocial behavour and shouldn't be around smaller children. Now I really don't know what to do as he has never been violent towards another child before while I have been around and according to nursery (where he goes a few mornings a week) he is very well behaved and kind - I have a DD1 who is 10 months and he has never been an issue around her...however, I do see this woman every week and have done so for the past few years, so I am now wondering if she has noticed something I haven't...no doubt he can be a pickle at times (i.e. playing with a ball in the house when he shouldn't, jumping on the sofa, when i've told him not to, fighting with his older brother over tolys)but I just sort of assumed that this typical behavour and part of the whole "testing the boundaries thing". So sorry for rambling, but I am really worried now about whether or not he is actually out of control and I have been so rubbish as a parent that I haven't noticed it....the thought that DS2 is capable of really hurting a little baby makes me feel really sick. Has anyone else experienced behaviour like this, and if so, what did they do about it?