So my daughter was around her friend last week on friday, he came down with chickenpox the day after. Now 6 days later she has started with a snotty nose and sneezing, does this mean the pox is likely on its way. How long did your child have a cold if they got one before the spots began to show? I know it's a 7-21 day incubation period with the most likely day being day 14. But just wanted to know how long your child had a cold before spots appeared.