Vaccines work by making us produce antibodies to fight disease without actually infecting us with the disease. If the vaccinated person then comes into contact with the disease itself, their immune system will recognise it and immediately produce the antibodies they need to fight it
Your baby’s next immunisations are due at 12 months one of the four vaccines they will be having is the Measles, mumps and rubella (MMR). You might be concerned that giving multiple vaccines at the same time may ‘overload’ the immune system, but studies have proven that this isn’t the case. As soon as your baby is born they come into contact with a huge number of different bacteria and viruses and their immune system is stronger as a result.