Apple ID not as secure as you may think

Did you give a child your device passcode or Apple ID password? They have to know one of those in order to change the password.

If they managed to change the password then you're in this situation: If you forgot your Apple ID password - Apple Support

MawMaw1012 Said:

"Apple ID not as secure as you may think: Has anyone ever had a child or loved one that is allowed to use your phone change your Apple ID password without you knowing they are doing so"

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I can't say that I have.

Don't Share your Credentials:

But don't share your passcode with anyone. And keep your Apple ID credentials to yourself --not sharing it with anyone whomsoever.