Babies/kids can start having the annual flu vaccine from 6 months according to my paed, although they have it in 2 doses when they are under a year old. I have had both my 19 month and 6 month sons vaccinated against flu. They have runny noses and coughs seemingly constantly. I put Vicks or Karvol on their chest and feet before they go to bed if they have a cold and that seems to help. I know the feet thing sounds weird but it seems to work!