2 year old grinding sound from jaw

2 year old getting very active, sometimes bump her jaw against me and I can hear this grinding sound like her jawbone is moving or something, normal?

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My son started to grind his teeth a few months before turning 1. But he only does it in the morning. I'll try to stop it by putting a handkerchief in his mouth. But eventually, he will stop when he wants to which luckily is not that long. :/