I really feel for you. That sounds like a terrible situation. If the behaviour had started recently ( especially considering you have a new baby) I would have said it was developmental but if he has always been unsettled I would say it is worth getting him checked out. Does he go to nursery or stay with family at all? If so, how is he with them?
@Lisa Yes, he goes to Nursery half day from 10 months and stays with family every now and then. When he is with other people he behaves better. I usually ask, did he misbehave? Was he nice? And they said, yeah, he was amazing. So I don't know..
If he is OK with other people it is unlikely to be anything requiring a diagnosis (in my unqualified opinion) It might be development misbehaviour that has been exacerbated by the recent changes with the new baby. Where abouts do you live? I would recommend contacting your nearest children's centre they will have people there who will be trained in this sort of stuff and will be able to help you.
I don’t think his tantrums sound very unique. It seems he is going through difficult emotions and does not know how to process - is there any way you could spend few days with him to learn him a bit more and bond a bit more? I know you have a small baby but that really can help. Eg do you know what leads to tantrums? Tiredness, hunger , some other pain. How do you behave - do you lash out? - you stay calm ? Here is the whole guidance that you will likely get from HV if you are going to contact them; bad behaviour usually means that babies are trying to communicate sth
Remember that difficult behaviours might be a sign that your child is unhappy or scared. You might need to help them find the words to describe how they are feeling. All behaviours have a purpose for your child. Before trying to change the behaviour, you need to know what the purpose of the behaviour is. What is your child trying to communicate? Examples of the purpose might be: To escape or avoid something. To get something, for example, food or a toy. Get attention. Sensory stimulation. To understand the purpose think about these: The Trigger, what happened immediately before the behaviour? Their behaviour, what exactly did your child do? The Consequences, what happened after? What did the child get from the behaviour? Use a behaviour observation chart to look at your child's behaviour. Can you identify the trigger, the behaviour and purpose? You may start to notice patterns. This will show you what the trigger is, for example tiredness or hunger. You can take steps t
https://www.nhs.uk/conditions/baby/babys-development/behaviour/dealing-with-child-behaviour-problems/
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Sorry for the misspellings, it was the autocorrection🤦‍♀️