I will travel to Harbin on 30-31 DEC 2010 with my family, Bangkok is still warm, not as cold as the place I will travel, this is my first trip to China. I have try to pack my pack and also prepare for child. Can anyone help me for advise or recommend how should dress, type of cloth and footwear, when stay there. Someone told me to prepare INSTANT HOT PACK to fix inside the cloth for maintain body's warm.

After that city, I will go to Shanhai on 01-03 Jan 2011, also need recommendation.