Chickenpox is caused by a virus known as Varicella virus. it does not need any specific medication most times just the symptoms are treated and if there are any complications.paracetamol for fever, calamine lotion to soothe the rashes, plenty of fluids intake then any associated complications are treated for example some can have Pneumonia will be treated as necessary. So see a doctor.

what are the things you observed in your baby that makes you feel he has contacted Chickenpox? I mean the symptoms he is showing.