It could be. Because most babies get antibodies against the virus from their mother while in the womb, it's unusual for a baby to come down with chicken pox during the first year. Those who do tend to have a mild case.
Chicken pox, also called varicella, typically causes an itchy rash that starts out as small red bumps. These bumps quickly change into clear, fluid-filled blisters on a pink base, which eventually become dry brown crusts. New waves of blisters often spring up as the illness progresses.
Your baby will probably be tired and slightly feverish. She may have a loss of appetite and, for a couple of days before the rash appears, a mild cough or a runny nose. Chicken pox usually lasts five to ten days.