My 6 year old DS has chicken pox. I'm not too worried about DD1 as she's 4 so I'm expecting her to get it too. I am worried however of DD2 as she's 4 months old. She's EBF but I know that it doesn't give 100% immunity from it. I'm just worried as she's so young? If she gets it will she be ok or can she get really poorly?