The MMR vaccine is not mandatory for 8-month-old babies because this type of vaccine is mostly given at 18 to 24 months of age, and it can be given outside of the prescribed time frame in special cases. MMR vaccine is a triple vaccine that can be used to prevent measles, mumps and rubella, and it can be given to children born at 8 months of age or older, but it is usually given at 18 to 24 months of age, and the vaccine that needs to be given at 8 months of age is the MMR vaccine. And special circumstances can be not within the prescribed time to vaccinate, but it should be noted that measles, mumps and rubella can be transmitted by air droplets, and highly contagious, so it is recommended that the vaccine within the prescribed time to prevent the corresponding infectious diseases. Therefore, it is recommended that children be vaccinated within the prescribed time, and it is not recommended to postpone it for too long, and in special cases you need to consult your doctor if you can be vaccinated.