Payal in 7 months we can't conclude about baby's immune system. It's true that breast fed babies falls sick less compared to formula fed babies but it doesn't mean breast fed babies does not catch cold or fever at all. So far my daughter catched cold twice and fever due to vaccination once so I think her immune system is good.<br><br><br> Your baby is just 8 months, I'm sure your doctor would have prescribed you fever medicine.. Give that now and wait till tomorrow morning, if its bad then take the baby to the doctor. Don't let the fever go high, so keep cold water Patti on her forehead often.