Cuddle up and read a book together. It's a quick and easy way to distract them from whatever is irritating them, and you can give them lots of positive attention while you're at it.
Your child’s development: Books are a great way to help your child learn about themselves, their world, and even their emotions. What do they think the character in the book is feeling? What happens when they feel sad/happy/grumpy?
Stories really help them with their language – you'll often find that as their words grow, and they can say more about what’s bothering them, their tantrums will start to die down.