Some of the diseases vaccines can prevent include diphtheria, Hepatitis A and B, measles, mumps and whooping cough.
Dr. Dean Blumberg, with the UC Davis Med Center, says getting kids vaccinated before the age of two is the healthy thing to do:
 
Kids, especially the young kids less than 2 years of age, are so much more vulnerable to many infectious diseases, and we’ve got vaccines that can prevent these diseases.
 
The national group Parents of Kids with Infectious Diseases, or P-Kids, wants to get the word out to Sacramento parents that vaccinating kids at an early age is crucial. 
California law does require immunizations for all children before they enter school.  But figures from the Centers for Disease Control show one in four Sacramento kids do not receive their vaccinations before the age of two.