I have a new whirlpool(cabrio) dryer. It dryed clothes 2 times last week and stopped heating to dry clothes.It is electric, it turns allright but will not dry the contents.Can someone help?

If you can work safely with electrican and know the hazzards, remove the back, Turn Dryer on Heat, look for voltage across Element, If you have voltage and no heat, the element is bad. Also If you have an Amprobe, you can check for the Voltage and It Will show the current if good.
If No Voltage follow back from Element until you see voltage, that is the sensor that is bad.
I also like to look for voltage across sensors, will show voltage if Sensor is open(Bad), If Sensor reads no Voltage it is good OR no power making it back around the circuit.
Rarely 2 things fail at the same time.