Babies this age are learning cause and effect. They want to see how they can affect the world and throwing things is super common as they want to find out what will happen when the stuff fall. Most important thing is to stay calm and don't give them a reaction, they love to see how you react so if you make a big deal out of it they will want to do it even more. Don't reprimand them or hit or yell at them. Just firmly repeat "No" while holding up the thing they threw. It will definitely take some time before they understand so be patient :)
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