New parents may want to sign up for Pfizer's app, which helps them keep track of their children's vaccination schedules. The app, called Vaxtext, is geared toward infants from 0 to 24 months of age on the recommended vaccine schedule. Vaxtext sends personalized messages to parents' smartphones based on the age of the children indicating which vaccine is next in line. The schedule covers vaccines for 15 different diseases. Pfizer's program does not promote one specific vaccine, and registration for the app comes at no cost.