It is very obvious that sibling rivalry or just plain old fashioned jealousy is the main problem with your 3 year old.He is getting up to some tricks which are getting to be dangerous.Sibling rivalry can be very unpleasant but it is a fact of life.Try your best to involve your 3 year old with a few tasks for his baby sister. Keep emphasisg that he is the big brother. When you have to intervene to stop him do so firmly and clearly. Do not beg him to stop.If he perists he must go to his room. Close the door and do not let him out until he is quiet and says he is sorry. If he does not say sorry he must stay in his room until he does. Make sure that he does not enjoy his time out. If he laughs about it put him back in his room. You will only be able to recommence his toilet training once you have got his behaviour right because he is attention seeking with his unacceptable smearing of his nappies etc.
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