The piston is getting stuck at top dead center (TDC). Very common occurrence with a brand new engine, especially if it is cold and is the first start of the day. Turn the flywheel with your finger until it just gets past that point of resistance and try to start it again.

If you want to make life even easier, buy an engine heater or heat gun and preheat the engine first before starting. In a pinch you can even use a hairdryer, though be careful not to melt things.