Hi Jaya,
Immunization schedules should be followed strictly to generate optimum immune response in a child against vaccine preventable diseases. You remember giving him last vaccination when he was two but exactly which ones? Please check if your baby has received one booster dose of DTP, IPV, MMR, Hib and Pneumococcal vaccines by the age of 2. One booster dose of Typhoid conjugate vaccine is also given at age of 2. If it is not given, you can give it now also.
At 4 years of age, booster doses of Oral Polio vaccine, Chickenpox and DTP are due.
It is best to make a personalized vaccination chart at Vaccinebox and get free reminders for 12 years and leave all the worries. You can still make the chart and update the previous vaccination history easily. The app will automatically analyze the given vaccination data and tell you which ones are due now. App also has an excellent feature of calculating the next due dates of vaccination based on the actual date which you will add. Please discuss with your doctor and get the vaccination done now. Don’t forget to update the given vaccination actual date and brand of vaccine for your future reference in the electronic chart. Parents have an easy to use tool to manage vaccinations of their child now. Vaccinebox send sms ad email reminders to parents and never let them forget their child’s vaccination date.
You may see the details of how to make your child’s chart here