My 2 year old child has a fever since Monday night. It is on and off mostly accuring at night. Other than fever, she does not have any other symptoms. However, since yesterday she stopped eating well. Today, I noticed thrush on her tongue and her gums are red mainly on the left side. Her twin, also developed a fever but it lasted 4 days. He also, developed mouth thrush and on top of that he is teething.