Rabies vaccination for one-year-olds does not affect development. Rabies vaccination involves injecting antigens specific to the rabies virus into the human body and stimulating the body’s immune system to produce protective antibodies. The whole process will only stimulate the body’s immune system and will not affect the body’s reproductive system, brain and other organs, nor will it affect the body’s development. Even if a one year old baby is vaccinated against rabies, it will not affect the development of the body and brain. The rabies virus has a mortality rate of nearly 100 percent once it is infected and develops. The rabies vaccine is one of the most effective ways to prevent rabies infection, so if your one-year-old is exposed to the rabies virus, he or she should be vaccinated promptly to prevent rabies infection.