Children of all ages can get chickenpox. The older you are when you get it, the greater the likelihood that any of the potential complications may occur. In general, a normally healthy six-month-old baby with chicken pox does better than an adult. In fact, if the baby's mother has already had chickenpox, her antibodies (things in the blood that help protect against it) were passed to the baby during birth. This then helps the infant and makes the disease milder.
Hope this answers your question. If you need more information on chickenpox you can ask your pediatrician.