White smoke when cranked in mornings only for a few minutes then never does it again until the next morning 2000 mustang?

Sounds like there is just a small head gasket leak. While the engine is cooling down and still under pressure it is collecting in the combustion chamber and that is why you are noticing it more at start up. It is burning coolant all the time but in small enough amounts that you dont notice. Keep an eye on your coolant level and check the oil for a frothy substance. If it is in your oil I would get it fixed or it will eventually cause engine damage. Good luck.