How do I patent and invention and protect myself against the company stealing my idea?

I have an invention for babies, and I want to patent my idea, but I'm afraid of any company I work with may steal my idea? What's the best way to protect myself so that the moment I reveal my invention, it is safe?

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protecting inventions

I would avoid doing online advertising for now if you are only 14 and keep your work to "friends/family/referrals" like the above. And as you build your contacts when you grow older you definitely should be able to have your own business!
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