Now, initially you think this is great. My son has never been sad. He's been angry, happy, excited, playful, sneaky... but never sad.

He is three years old. I cannot ever recall him being sad. If you stop him doing something or take a toy away, he gets angry. He has thrown the odd tantrum. But even his carers at Nursery agree that he isn't sad, he's angry instead.

Is this normal? Do I need to do something to help him? He can tell me other people feel sad, so he recognises it as an emotion, but he doesn't display it himself.