Level 1: Symptoms of a Baby Cold A baby cold is a common illness that is usually caused by a viral infection. Typical symptoms of a cold in babies include runny nose, sneezing, throat irritation, fever, etc. Since babies\’ immune systems are not fully developed yet, they are susceptible to infections. If your baby has the above symptoms, please seek medical attention promptly. Level 2: How to Prevent Colds in Babies Prevention is the best treatment, so preventive measures are very important. Here are some precautions: 1