After a baby has a rash, it is not necessarily followed by chickenpox, as these are two different illnesses. Generally speaking, having had a rash does not have much of an impact on whether or not you will still get chickenpox. Babies can have rashes in a variety of ways, such as toddler emergency rash, rubella, measles, etc. These viral rashes are not directly related to chickenpox. Whether a baby will develop chickenpox depends mainly on whether he or she is infected with varicella-zoster virus and whether he or she has been vaccinated against chickenpox. For the majority of children vaccinated against chickenpox, chickenpox can play a certain preventive effect. It should be noted that it is not true that chickenpox will not appear again after receiving chickenpox vaccine, some children will still have chickenpox after receiving chickenpox vaccine, but the symptoms will be relatively less severe. Therefore, the baby rash and whether the chickenpox is not directly related to avoid chickenpox usually should pay attention to do a good job of protection, while doing a good job of vaccination.