Just a question, my dd2 might have chicken pox. Does anyone know if it has to go on the stomach to be classed as chicken pox? At the moment she has it all over her bum and some down her legs and arms. The doctors think it is but can't class it as chicken pox until it has reach the stomach! Does anyone know how long the incubation period is? And what are the chances of her sister and 5 month old cousin getting them?