DD (2.5) has chicken pox. Her baby brother (12m) hasn't come out in spots or anything yet. Keeping her off nursery as per NHS guidelines but not really clear if I should be keeping him off too? I know the incubation period is as much as 3 weeks, but I can't really be keeping him off for the next 3 weeks waiting for spots that may not appear, but also don't want to be a dick sending him off to infect the rest of nursery.