Transit Visa for Nepalese citizens

We are Nepalese citizen (3 person travelling) from USA to Nepal via China as below:
JFK to PVG - Shanghai-pu Dong, CN: arriving at 04:40 AM; layover of 03:00 Hours
PVG - Shanghai-pu Dong, CN to KMG - Kunming, CN; layover of 03:20 Hours/minutes
KMG - Kunming, CN to KTM, Nepal
Our total transit in china is going to be around 12 hours total with flight and layover time. We have two stop in china.
Because of this, do we need transit G or not.