It is unusual that your older children both had mumps as they should have been immune to this illness due to their immunisation with the MMR at 15 months. Your oldest child should also have had the MMR booster at 5 years.Your 4 year old still has to have the booster.
Babies can get mumps, but fortunately it is very unusual for children under 2 years to get mumps. There us no known way of preventing a baby from getting mumps. The MMR immunisation is only given at 15 months.The incubation period for mumps is between 14 and 18 days so it is very difficult to know if your baby is going to get mumps or not.
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