Mountain Bike makes creaking noise?

I walk alone

New member
My bike's a week old and it makes a slight creaking noise when you stand up and pedal. I'm not entirely sure of the source but it could be at the pedals, the front handlebar or the front fork for the front tyre.

It's only when you stand up and pedal (and moving your weight side to side as you do), all other times it's silent
What should I do?
 
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