Hi, it could be due to stress, and one reason also stomuck worm. It's better to take advice your pediatrician.

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I heartily thank you for your reply, which eased me a lot.

It could be due to stress or bad dreams. Try relaxing your kid cuddle her, give her a cozy bedroom environment, give her lots of pillows to feel safe, massage her . Also go for detail checkups as this habit may damage the teeth

Don't be so stressed