First time to Shanghai on 6 Dec to 13 Dec with my Child age 7 and 9, what to prepare?

During that time, the temperature will drop a lot, so it is cold and rains a little from time to time. You should prepare Long John, light sweater, down jackets and thick pants for your kids. Check ahead the wether forecast. If any rainfall is reported. you'd better pack simple rainy gear as well.